Guru Racing = 260 HP and 280 fpTQ at rearwheels
09-08-2002, 02:11 PM
#1
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Guru Racing = 260 HP and 280 fpTQ at rearwheels
Travis and Danno installed, tuned and dynoed one of their GURU Racing Stage 2 kits on my 86 951 yesterday. Bottomline observation? The installation was very clean, and the performance increase is friggin awesome.
A little background about the starting point. My 951 is sporting 117,000 miles, with a fresh stock turbo, stock injectors, with a few performance mods. Those mods are a Weltmeister Stage 1 chipset with wastegate shim, an LBE and a K&N filter.
This set-up offered a definate improvement over the stock chip/wastegate. I never dynoed the stock set-up but I think that it conservatively gave me an increase of 20 HP and 20 fpTQ.
For comparison purposes, the car was dynoed first thing in the morning and produced the curves indicated as DYNORUN.002 in the attached dyno sheet. A not too shabby set of numbers- 224.7 HP and 252.4 TQ.
Once we baselined the car, Travis and Danno started removing the stock intake, air meter, etc, and installed the Stage 2 kit. All this took about an hour. Not bad for two guys with about four hours sleep between them. ;-)
A few mishaps later, hey my car is old, and vacuum fittings get brittle after 15 years, we had full boost and Travis started dialing the A/F mixture settings. Not a messy technique at all, they've got a swank controller; and updating the database is a simple process.
--I'm looking forward to a Palm Pilot controller version ;-)--
The results were great. 255.9 HP and 277.9 fpTQ. If you subtract the estimated numbers from the Weltmeister chipset, that comes into something in the range of nearly 60 HP and 50 fpTQ increase over stock set-up for my 951.
Not bad for a grand and change.
Seat side observations? The torque is awesome. Nice juvenile wheel spin potential, factory smooth, and after letting off the throttle, it returns to idle better than the factory intended. The power helped out a lot as I returned home, driving over the insanely twisty route 17 back to Santa Cruz, passing irresponsibly and gleefully, at every opportunity.
This old man is pleased with the investment.
I can't think of anyone I'd rather hand a wad of cash to than Danno and crew. I believe in supporting grassroots stars and I can't think of two better examples here at Rennlist than Travis and Danno.
Good luck to Guru Racing. I hope you guys can make some dreams come true for your customers and for your business alike.
Cheers,
Steve Cooper
A little background about the starting point. My 951 is sporting 117,000 miles, with a fresh stock turbo, stock injectors, with a few performance mods. Those mods are a Weltmeister Stage 1 chipset with wastegate shim, an LBE and a K&N filter.
This set-up offered a definate improvement over the stock chip/wastegate. I never dynoed the stock set-up but I think that it conservatively gave me an increase of 20 HP and 20 fpTQ.
For comparison purposes, the car was dynoed first thing in the morning and produced the curves indicated as DYNORUN.002 in the attached dyno sheet. A not too shabby set of numbers- 224.7 HP and 252.4 TQ.
Once we baselined the car, Travis and Danno started removing the stock intake, air meter, etc, and installed the Stage 2 kit. All this took about an hour. Not bad for two guys with about four hours sleep between them. ;-)
A few mishaps later, hey my car is old, and vacuum fittings get brittle after 15 years, we had full boost and Travis started dialing the A/F mixture settings. Not a messy technique at all, they've got a swank controller; and updating the database is a simple process.
--I'm looking forward to a Palm Pilot controller version ;-)--
The results were great. 255.9 HP and 277.9 fpTQ. If you subtract the estimated numbers from the Weltmeister chipset, that comes into something in the range of nearly 60 HP and 50 fpTQ increase over stock set-up for my 951.
Not bad for a grand and change.
Seat side observations? The torque is awesome. Nice juvenile wheel spin potential, factory smooth, and after letting off the throttle, it returns to idle better than the factory intended. The power helped out a lot as I returned home, driving over the insanely twisty route 17 back to Santa Cruz, passing irresponsibly and gleefully, at every opportunity.
This old man is pleased with the investment.
I can't think of anyone I'd rather hand a wad of cash to than Danno and crew. I believe in supporting grassroots stars and I can't think of two better examples here at Rennlist than Travis and Danno.
Good luck to Guru Racing. I hope you guys can make some dreams come true for your customers and for your business alike.
Cheers,
Steve Cooper
09-08-2002, 05:14 PM
#4
Nordschleife Master
[quote]Originally posted by Steve Cooper:
<strong></strong><hr></blockquote>
14:1 most of the time, isn't that a little lean?
Stoich is 14.7:1 I believe...but peak power is 12.5:1 isn't it??
--adrial
<strong>
</strong><hr></blockquote>14:1 most of the time, isn't that a little lean?
Stoich is 14.7:1 I believe...but peak power is 12.5:1 isn't it??
--adrial
09-08-2002, 07:15 PM
#6
Rennlist Member
On the fuel curve question:
You need to consider where Danno was on the boost curve and advance curve when examining the AFR. I run around 13.5 - 13.8 in the lower rpm's until I start to build boost. Then start dialing it down towards 12.5 - .2 and take it back up around 6000 rpm to 13.1.
Works for me at 22 psi <img src="graemlins/drink.gif" border="0" alt="[cherrsagai]" />
Alan
You need to consider where Danno was on the boost curve and advance curve when examining the AFR. I run around 13.5 - 13.8 in the lower rpm's until I start to build boost. Then start dialing it down towards 12.5 - .2 and take it back up around 6000 rpm to 13.1.
Works for me at 22 psi <img src="graemlins/drink.gif" border="0" alt="[cherrsagai]" />
Alan
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09-08-2002, 09:35 PM
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Adrial,
You're right about that disturbing lean AFM curve. Thing is, that upper red line you're referring to was the Weltmeister chipset's fuel mix. The blue line below is the Guru MAP AFM curve. It hovers between 12-13 for most of the range.
Pauerman, I've never checked the injector's duty cycle. Wish I had an answer for ya on that...
You're right about that disturbing lean AFM curve. Thing is, that upper red line you're referring to was the Weltmeister chipset's fuel mix. The blue line below is the Guru MAP AFM curve. It hovers between 12-13 for most of the range.
Pauerman, I've never checked the injector's duty cycle. Wish I had an answer for ya on that...
09-09-2002, 12:28 AM
#9
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Steve,
You've got to be pretty excited. I need to step up my efforts to scrap together some cash. I really like how the torque flat lines between 3500 to 5000 rpm as opposed to the Welt chips which peak and then immediately begin to drop off. Any idea if this is due to the increased efficiency of the intake or timing adjustments particular to Guru's chipset? What boost level were you running? Was the boost the same for both runs or did the elimination of the intake restriction cause you're setup to run a bit higher boost with the Stage 2 Map?
You've got to be pretty excited. I need to step up my efforts to scrap together some cash. I really like how the torque flat lines between 3500 to 5000 rpm as opposed to the Welt chips which peak and then immediately begin to drop off. Any idea if this is due to the increased efficiency of the intake or timing adjustments particular to Guru's chipset? What boost level were you running? Was the boost the same for both runs or did the elimination of the intake restriction cause you're setup to run a bit higher boost with the Stage 2 Map?
09-09-2002, 01:40 AM
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Skip,
Unfortunately I run the stock boost gauge, so I don't have any exact boost numbers. We didn't alter any boost settings for any of the dyno runs. The only adjustments that I noted were fuel related. Once we sorted out a few niggling connection issues the boost seemed higher than the Weltmeistr chip set-up. Travis had the opinion that the drop in torque and peak power was due to my wastegate, again stock, but shimmed. If it were holding better chance are the power would have stayed consistent throughout the top rpm range.
Cheers,
Cooper
Unfortunately I run the stock boost gauge, so I don't have any exact boost numbers. We didn't alter any boost settings for any of the dyno runs. The only adjustments that I noted were fuel related. Once we sorted out a few niggling connection issues the boost seemed higher than the Weltmeistr chip set-up. Travis had the opinion that the drop in torque and peak power was due to my wastegate, again stock, but shimmed. If it were holding better chance are the power would have stayed consistent throughout the top rpm range.
Cheers,
Cooper
09-09-2002, 01:45 AM
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Skip,
Oh yeah, I'm definitely excited. Aside from the boost in performance, the sounds are great. The "funnel'like" intake has a very pleasing characteristic, it lets the turbo be heard. It's a very sweet tune.
Cooper
Oh yeah, I'm definitely excited. Aside from the boost in performance, the sounds are great. The "funnel'like" intake has a very pleasing characteristic, it lets the turbo be heard. It's a very sweet tune.
Cooper
09-09-2002, 02:19 AM
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Jason,
Danno and I have been talking for a while now about seeing what the maximum performance gains a stock turbo and injectector set would yield. Putting the stage 2 on my car was a bit of an experiment. I'll likely upgrade turbos and injectors in the next year, this system can grow with my irrational horspepower needs. I like that.
We replaced the stock intake and J pipe with Danno's "funnel"
<a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic&f=15&t=010896" target="_blank">spy shot of danno holding the guru racing intake pipe...</a> The new K&N filter sits behind the driver side headlight. I'll post before and after shots tomorrow.
Cooper
Danno and I have been talking for a while now about seeing what the maximum performance gains a stock turbo and injectector set would yield. Putting the stage 2 on my car was a bit of an experiment. I'll likely upgrade turbos and injectors in the next year, this system can grow with my irrational horspepower needs. I like that.
We replaced the stock intake and J pipe with Danno's "funnel"
<a href="http://forums.rennlist.com/forums/ultimatebb.php?ubb=get_topic&f=15&t=010896" target="_blank">spy shot of danno holding the guru racing intake pipe...</a> The new K&N filter sits behind the driver side headlight. I'll post before and after shots tomorrow.
Cooper
09-09-2002, 01:06 PM
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Steve: Thanks for documenting on film. One of your pics, of the grey 951, 300+ RWHP, you forgot his name, with the 964 Turbo polished lip wheels (actually called Cup 1 style)...I'd like to find out more about those wheels: Did he acquire them that way or have them done? Does he lurk on this forum? Are they true Porsche wheels or Mille Miglia or ? Anyone?
