UK 3.2 Turbo hits the road
#121
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Get or look into some Nitto Nt555R Drag radials 275.40.17 they are the most amazing tires that I have ever owned. Also, they handle and stick on corners like you would not beleve. If your sitting at a stop like and you nail it, they hook reall well. I had traction problems all the way through the end of third gear and now, it feels like a differnet car. I had never experianced the feel of that in my car.
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What's the lifespan of a Drag Radial?
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Originally Posted by Diver944
Pah - where's the fun in that . Grip is highly over rated. I've been doing a little digging on Google and as far as I can ascertain the RUF Yellowbird with over 450bhp came on exactly the same size 17" tyres that I am running now.
With my old car, I "only" had 265s on the back and had bad traction issues too. I recall several times running at 18PSI making only 460 RWHP, air temps exceeding 80+, in 3rd gear at 65 MPH and my car made the tires do a full burnout, not a spin or a chirp. At a minimum, with that car of yours for the street, even with very modest boost, I'd get 295s on the back. Trust me, you'll need them when that car is tuned right and broken in too. The track set-up is even a different story too. I am doing extensive research into both applications as we speak. I'm looking at custom wheels made by two different companies. Anyway, sorry to go OT pal.
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Last edited by RolexNJ; 12-31-2006 at 06:35 PM.
#124
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These drag radials are good for close to 15 to 18k. you do not need custom weels or anything like that they cost around $150 each and I have a 2.5 with a over 400whp at 23psi and Im telling you guys you gota try out these things. like I said before, they are the best handling tire I have ever owend to a point that the car can understeer in some situations, thats how stable the rear end is. And as far as accleration they rock, and no you do not need to do a burn out to get them to work properly. if your drag racing and you want to at that point. check them out on their web site.
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Originally Posted by shane rizzo
like I said before, they are the best handling tire I have ever owend to a point that the car can understeer in some situations, thats how stable the rear end is.
#126
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Originally Posted by shane rizzo
These drag radials are good for close to 15 to 18k. you do not need custom weels or anything like that they cost around $150 each and I have a 2.5 with a over 400whp at 23psi and Im telling you guys you gota try out these things. like I said before, they are the best handling tire I have ever owend to a point that the car can understeer in some situations, thats how stable the rear end is. And as far as accleration they rock, and no you do not need to do a burn out to get them to work properly. if your drag racing and you want to at that point. check them out on their web site.
Hmm, are you sure those are drag radials? What brand and model? Usually DR's in a decent size are pretty expensive. At one point I had BF Goodrich Gforce t/a DR's in 275/35/18 on my 911 at 430whp. I think they were around ~$200-250 a piece. They were gripy enough that I'd just barely spin through second, and would grip in all other gears. Just FYI but DR's don't last very long. They have very soft rubber compounds, and regular street driving will wear them out pretty quick. I think I got something like ~4-5k of realistic life out of them driving on the street with the occasional spirited run, and after that they were pretty much bald. They grip hard, and even on damp surfaces, however they handle like complete @ss compared to any decent performance street tire (Falken 615's, S02's, Pilot Sports, etc). DR's have very soft sidewalls which does not work well for handling. My 911 felt a bit "floaty" on the highway because of this. If you are used to crappy econo tires, I'm sure any DR's are going to feel light years better.
Well, I took a look online at the Nt555r's. Here's Nitto's Link and here's the link to the BFG's I had Link
It looks like the Nt555r's aren't really a true DOT legal DR in the same sense of the word. BFG's like the one's in the link above are more along the lines of what a street DR is like. It appears like the 555r's are more of an R compound then an actual drag radial. Either way, from what I hear from friends, the 555r's seem to be pretty decent, and I'd be willing to bet that they'd definitely handle better then the BFG's.
#128
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I have had pilot sports and other high end street tires and all I can say is I have not had a tire that grips like this on corners and going stright. Im not trying to sell these things just giving you my opinion on them that is all. i think they only come in 275.40.17 and they are the 555R tires also, they say extreme drag on the side wall. As far as cost, they are pretty cheap and dont cost that much.
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Originally Posted by indi9xx
One thing I need to point out. The Chips in Paul's car are NOT special 3.2 chips, but our off the shelf chips we use as a base for modified 2.5 turbo 944's. They are known as the KH chips, after the guy that designed them, Klaus Hoffman, who was the same chap who made the original maps and software for the 944 turbo for Porsche. These chips are the same chips that the 944 turbo was originally supposed to be released with, before Porsche insisted that limitations be programmed into the DME and KLR to hinder performance tuning. We installed these chips in Paul's car originally just to see if they would be good enough just to run up the car in the workshop, but it has completely blown us away that they not only got the car started but are still in use now, causing a loss of traction in almost any gear on a 3.2 engine!! Once the car has a propper custom map (fuel and ignition) I think Paul's car will come alive... at the moment LIL is breathing through straws (std exhaust, AFM and intake) and with chips designed for a completely different application. So treat it as LIL is currently in "limp home mode"... I cant wait to see what she is like once she can stretch her legs properly!
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#130
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The chip installed, in theory is almost a "safe mode" 16-18 psi for this engine. Due to the 3.2 design in theory the optimum for this engine would run an ignition map with more advance due to the increased area for the flame front to cover. Even though the ignition map isnt advanced as far is would be optimal it of course isnt retarded to a point which is dangerous either.
Paul should be getting a dedicated map shortley, which will release much more power and hopefully clear up one of the few problems with Paul's car, which is the first few moments when its cold started it runs a little rough (and rich)
Your right though... the ignition maps are very far from ideal at the moment, not to mention the fuel could be optimised a little at high rpm, along with everything being setup to run 3.0 bar of fuel pressure rather than the 2.5 its running at the moment.
Paul should be getting a dedicated map shortley, which will release much more power and hopefully clear up one of the few problems with Paul's car, which is the first few moments when its cold started it runs a little rough (and rich)
Your right though... the ignition maps are very far from ideal at the moment, not to mention the fuel could be optimised a little at high rpm, along with everything being setup to run 3.0 bar of fuel pressure rather than the 2.5 its running at the moment.
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Originally Posted by indi9xx
Paul should be getting a dedicated map shortley, which will release much more power and hopefully clear up one of the few problems with Paul's car, which is the first few moments when its cold started it runs a little rough (and rich). Your right though... the ignition maps are very far from ideal at the moment, not to mention the fuel could be optimised a little at high rpm, along with everything being setup to run 3.0 bar of fuel pressure rather than the 2.5 its running at the moment.
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#132
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Paul is keen on the Vitesse MAF... He is also keen on a dedicated map for his car.
The worry is, a chip tuner is going to be uneasy messing around with the maps when VR MAF has its own engine load/airflow code in the chip...
I need to get in touch with John at VR and have a chat to him about what he can offer, as the ideal solution it would seem would be a VR-MAF, with a map that he thinks would see us in the right ball park, and then ideally a version of VRLiveEdit but for the VR-MAF, so we can then go on a rolling road and fine tune it a little and continue developing things further without bouncing rom images back and forth across the atlantic to and from JV just because we want to try out a "what if" alteration with the mapping.... But I dont think this is available (VR-LiveEdit for VR-MAF)...
(
There are fundamental flaws in the other MAF's on the market at the moment, which makes us steer clear at the moment or at least makes me have concerns.... But so far with what I have seen of the VR item, it seems like the proper way of doing things.... If only there was VRLiveEdit for the MAF version of the prom!!!
The worry is, a chip tuner is going to be uneasy messing around with the maps when VR MAF has its own engine load/airflow code in the chip...
I need to get in touch with John at VR and have a chat to him about what he can offer, as the ideal solution it would seem would be a VR-MAF, with a map that he thinks would see us in the right ball park, and then ideally a version of VRLiveEdit but for the VR-MAF, so we can then go on a rolling road and fine tune it a little and continue developing things further without bouncing rom images back and forth across the atlantic to and from JV just because we want to try out a "what if" alteration with the mapping.... But I dont think this is available (VR-LiveEdit for VR-MAF)...
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There are fundamental flaws in the other MAF's on the market at the moment, which makes us steer clear at the moment or at least makes me have concerns.... But so far with what I have seen of the VR item, it seems like the proper way of doing things.... If only there was VRLiveEdit for the MAF version of the prom!!!
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Originally Posted by indi9xx
Paul is keen on the Vitesse MAF... He is also keen on a dedicated map for his car. The worry is, a chip tuner is going to be uneasy messing around with the maps when VR MAF has its own engine load/airflow code in the chip. I need to get in touch with John at VR and have a chat to him about what he can offer, as the ideal solution it would seem would be a VR-MAF, with a map that he thinks would see us in the right ball park, and then ideally a version of VRLiveEdit but for the VR-MAF, so we can then go on a rolling road and fine tune it a little and continue developing things further without bouncing rom images back and forth across the atlantic to and from JV just because we want to try out a "what if" alteration with the mapping.... But I dont think this is available (VR-LiveEdit for VR-MAF)...
(
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But let me say this about John and his products. I have used just about every product he offers, and to me, they are by far the best! I was just posting in another thread my experiences with his MAF and custom chipset-board. With John's chips, right out of the box you will find that his A/F is 95 - 98% on the money, and I'm not kidding at all. If you want to use a Piggyback and get it better, you can tweak it some more. But I was astonished at how close to perfect it was for me after we just plugged it in. I bought his SMT6 software, and Special Tool and I did a few datalogs while driving the car. We also used the Zetronix ZT-2 to view all the variables too. That is an amazing tool I might add. Then, we tweaked it a bit more and got it even better!! And I'm sure you know this already too, but with his chips, the A/F ratio will remain perfect regardless of what PSI Paul runs. No more of having to retune it for hours and hours for different boost levels. Anyway, I hope this clarified things a bit fot you? As I said, I may be wrong about the VRLiveEdit, so ask John.
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#134
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All we really need to be able to do is have a VR-MAF and some way of altering the ignition and fuel mapping ourselves without having to dig around with a hex editor... Is this what the piggyback does? it allows ignition and fuel trimming of the maps?
I will get in touch with John tomorow once I have had another look on his site to get an idea of his products... I think its the way to go, either that or stand alone.. But it would be nice to stick with the motronic and I expect Paul would probably like to save a few bucks over a stand alone as well!
I will get in touch with John tomorow once I have had another look on his site to get an idea of his products... I think its the way to go, either that or stand alone.. But it would be nice to stick with the motronic and I expect Paul would probably like to save a few bucks over a stand alone as well!
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Originally Posted by indi9xx
All we really need to be able to do is have a VR-MAF and some way of altering the ignition and fuel mapping ourselves without having to dig around with a hex editor... Is this what the piggyback does? It allows ignition and fuel trimming of the maps? I will get in touch with John tomorow once I have had another look on his site to get an idea of his products... I think its the way to go, either that or stand alone.. But it would be nice to stick with the motronic and I expect Paul would probably like to save a few bucks over a stand alone as well!
And a EMS for Paul? Honestly, from what I understand how Paul plans to use the car, that would be overkill. John's EMS stuff sound to me like the ideal answer for Paul's application. Reach out to John, and let us know what happens. And hey, tell Paul to get his butt on Rennlist and post once in a while, and to give us some more pics too!
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