blown 944

I've been going over my plans for next year. I have been thinking that my setup is plenty as it is. Well it really is, to run in the tens, and it will do that. However, I'm setting a new goal to compete directly against Supras,Evos, Subarus in the local Import shoot outs. I want to beat them all in MPH. Up here that means I will need to run 140-145 MPH. I believe I can do it.

As it stands, I can relatively easily add another 100 rwhp by changing cam and valve size.I have measured 575 rwhp so far. Just not at the track. Up there I have measured 540ish rwhp and that coinsides with my MPH and weight. I just went 126.7 Weds night on horrible tires and looking at my slips I am down over 5 mph in the eighth mile.

So doing the math comparing general results.

If I would have been able to maintain my 100 mph 1/8th mile speed and use that with my 126 run (95 in the 1/8th) this week I would have ran 131 (I'm being pretty conservative. I believe it will do that with proper tires and the air I have now. Unfortunatly the season is ending.

So onto what I will need.

Current config..a true 550 rwhp at elevation

Planned mods.

8 valve head
Biggest valves I can fit in NA head with coated exhaust runners (maybe 2.7 head)
.100 longer valves with small stems
proper sized valve springs with around 150 seat pressure
titanium retainers
maximum port work done by me.
looking to flow around 245 cfm

Cam

custom small base circle
duration design to be determined
around .570" lift


8 injectors
2 044 pumps
custom Rogue tune
add timing to where I currently am (32 degrees at 6000 rpms at 22psi) I will be testing timing on the dyno soon with current setup.


HX52 turbo

Raise RPM limit to 7800 rpms

Blow engine ..But that should get me to 140

next shortblock.

My design, but 3.1 plus liters using a 93 mm stroke

103.1 bore

7.5:1 compression. Pistons in hole .150"

Fill block to .400 below deck

start with big 8v head. Then 16 v if needed


Using my calculations I should be able to make over 800 rwhp with the 3.1 and around 25psi.


thoughts, ideas, contributions....any response is welcome. Especially from those who are in the BIZ.

gruhsy

Build one for my second turbo

nics951

My thoughts? Build 2. . . I want one

Paulyy

LOL Let him build it first!

sounds interesting! very interesting.

my first question is, will the gearbox hold up?

blown 944

Good question. Probably not depending on how hard I launch it. But again probably not.

I have a couple ideas in my head about wht I'm going to do about it. One is a 968, the other is installing a t56 with a Mercedes differential.

Right now though I'm focusing on the engine and keeping spare transaxles close by.

333pg333

Why such low c/r Sid? I suppose for a drag car higher c/r isn't as important and it's extra safety?

Reimu

Well this thread's title certainly stands out...

blown 944

Take a read back on some old Group B comp ratios.

Safety, proper intake swirl wiithout restriction, piston temps, combustion chamber volume.

The stroke will more than take care of any drive ability issues. My current engine is a testiment to that.

333pg333

Oh sure, cars ran much lower c/r in the past. I just thought with modern tuning and E85 you wouldn't need to go lower than 8's? Man, I've got a killer 16v head (and block for that matter) that you'd like...just not sure you'd like the co$t.

btw...some of the specs you're describing in the big 3.1 8v build are similar to mine. Well not the stroke of course. Wonder what it will be good for by comparison to yours?

blown 944

Pat, out of respect to others I don't really want to comment on comparing what I have done to others. Your engine will make a lot of power I have no doubts.

Fortunately, I can do everything myself. Your's is a larger bore and mine will be mostly stroke so that's where the biggest difference will be IMO.

I will have a vast amount of work done to the crank that will do more for longevity, oiling and weight than my current setup.

the main reason I'm going with low compression is for reliable BIG power. I've experimented with higher compression and I'm not impressed and it felt pushed. This engine feels like I could just keep cranking it up and up. I'd expect the bigger engine to be similar, but with a larger percentage gain per psi.

thingo

Do you have a dyno sheet of the 550rwhp?

Ski

Corvette Transaxle with custom torque tube end and coupler?

blown 944

why do I need a dyno sheet when my MPH dictates it for real?

Dyno sheets just for the sake of a big number is a waste of paper IMO.

Every time I've dynod before the number was quite a bit higher than what I use for true rwhp measurements. (trap speed and weight)

Every other car I've read on here dynos quite a bit higher than what they trap at using my calculations. So if anything, the way I measure is MUCH more conservative than DYNO postings.


You can doubt how much power it's making all you want, but here are a few examples of past excepted dynos and what the cars ran

ST 602 hp and 120 mph (lighter than me)
TMS 420 hp and 112 (lighter than me)
DanaT 355 and 110 (just heavier than me)
95one 415 and 122 (very light car)
Markus 495 and 124 (similiar weight)

These are all direct comparisons and my car traps higher than all of them at 127+. This is at high elevation as well. Figure in that I have seen big gains just by turning up the boost a little more in (MPH between the 1/8 and 1/4 gained 31 mph vs 27 on my best run ) 550 is not even close to out of range. If I can get some new tires on shortly I'll gaurantee a 130 trap which would be closer to 600 rwhp (for real, not some sheet of paper)


I can get a sheet of paper whenever.. I prefer the real deal.

Rather than doubt my numbers..Why don't more people try to test their numbers vs reality? I'm pretty sure there would be quite a bit of dissapointments to be handed out on those sheets of paper.

Call me a cynic, but until I see a bunch of these cars running the traps I run, I'd rather stand by my method..moving weight from Point A to point B.. The true definition of horsepower.

Edit:

here is an online calculator. Due to these cars taking off so slow you have to add a small percentage (around 12%) to be on par with normal drag car dynos. IMO is is a much better gauge than a dyno.

Feel free to plug in weights and MPH to get an accurate picture of what I'm talking about.

For example.
95one shows only 360 hp @2500 pounds
ST shows only 385 at 2850
Markus shows 475 ish
Mine shows 495 at my 127mph and 3000 it shows 540 with the extrapolated numbers from my last runs.

I've been using this measurement vs engine dynos for decades now and it's pretty accurate

DanaT

Sid you numbers are very interesting.

TMS 420 hp and 112 (lighter than me)
DanaT 355 and 110 (just heavier than me)

That evening I weighed in at 3305 with me in car. I think you are 200-300 lighter than me (I can probably drop 100lbs quickly..take the spare, inflator, tools, etc out of the trunk)

Is it not strange that a car with 420hp and at probably at 300lbs lighter ran barely faster mph than I did?

My conclusion is that the dyno used my TMS was optimistic.

You cant BS the mph in a quarter mile

boerge

Agree totally to what Blown just explained.