max psi & what mods done?
 

Hey, well im new to this forum and just been browsing through it for a few months and now time to post something..
anyway im just wondering how much psi your running in your 951,952 ect and which mods are done and what are the outcomes?

Cheers, Paulyy

With the 26/6 and typical bolt-ons (notably full 3'', no cat, MAF and dual port wastegate) my car made right around 265whp/265ft-lbs at 14psi on a DynoJet. The spool-up on this setup was great, usually 1-bar in the sub 2700rpm range depending on conditions in 3rd. I put in a larger turbo last year (60-1 HiFi) but have not had a chance to dyno it yet, based on what others have experienced i am betting in the 300-325whp range at 15psi.. of course at the expense of more lag.

A 951 with a 26/6 at 15psi will easily do around 230whp with just chips and cat-delete. The 26/8 probably around 20-30bhp over that.

s**t thats pretty good :) im just running a standars 26/6 with a 3" borla exhaust + 38mm tial wastgate & an AFM Link (came with the car) running 15psi. unsure what whp its at. just wondering on others peoples cars to see which extend i can go to, to get a decent amount of whp with which mods to attent

Im pushing 16psi with a 26-8, guru chip, and #65 delco's. No MAF. Yet. Not sure about my exhaust size. I havent explored my car fully yet. All I know is that my car is stupid fast. I would like to install and MAF and a 38mm Tial WG soon.

I'm running roughly 14.3 psi on my '83. No special mods

Yeah I run atmospheric pressure one mine too. Only notable mod is a v-8. Mine is kinda fast.

Mine's not all that fast, maybe I should move to the coast or better yet, New Orleans, to up the psi a bit.

Hijack off.

so pretty much most run around 13-16 psi.
what would you guys recommend, either boosting the psi to around say 18 psi and changing the injectors or turbo upgrade and sitting at a nice 15 psi?

I'm no expert, but it seems to me that once you begin to boost over 17psi, you need to be careful about detonation and lower end components. I think the 86 951 has forged rods like the 83 N/A, so you should be ok there. Chip it, put on a K26/8, larger injectors and a manual boost controller.

yes but the 87 + turbos dont have forged rods. also above 17-18 you deal with inconsistent gas quailty and that plays a big part of detonation

Cast rods were a mid-year '90 thing for ROW cars. Everything else was forged on the 951.

If you want to run up to 18psi its time to look at a bigger turbo. Mainly something with a larger hotside, i would go atleast with a #8 if you keep the triple-K flange. Cat-delete is a must and at that boost fuel support is now something to think about also. There are tons of options, pick a realistic HP goal and factor your budget in. Don't be drawn in by big HP #'s from huge turbo's because turbo lag will be killer, especially on our cars. The huge surge of power from a big turbo is nice, but for a street machine a smaller faster spooling turbo is much better for drivability.

Ya I know a guy that had a 951 with a 3.0 stroker and huge turbo.... He said it was faster as a 2.7 stroker with a smaller turbo.... It was rare that you could get it up into the effective range and keep it there... I think it came on boost at about 4500....

My kid (Trivgar) has run his 86 951 up as far as 26 PSI and amazingly, has not blown it up. He's really careful about the AFR. Under normal conditions, he usually runs 16-18 PSI which is more than adequate.

He's modded the car about as much as is possible without a major re-working of the engine (like what Nize did with his, which is insanely expensive).

The car is crazy fast, and with the modded suspension, rides like a race car.

Sadly, we haven't had it dynoed since he installed the MAF and the larger turbo. He was shooting for 350-400 RWHP.

He figures he's got somewhere around $20K in it.

His mods:

• Lindsey Racing Stage 2 MAF with a piggyback controller

• 3 Bar FPR

• 951Max Chips

• 75# injectors

• Lindsey Racing Super 65 Turbo

• Open Tial 38mm dual port wastegate

• Innovate LC-1 Wideband O2 sensor and digital AFM gauge

• Lindsey Racing Manual Boost Controller

• Lindsey Racing 3" cat-less, muffler-less exhaust with a resonator

• Koni adjustable struts with adjustable ride height with 425# springs and solid strut mounts

• Koni adjustable shocks with 550 # Rear Coil-overs (torsion bar delete)

• KEP Stage 2 pressure plate and Clutch Net racing clutch

http://www.mikepellegrini.com/Graphics/maf.jpg

A thread his friend Jason started documenting the build: 86 944 (951) - Turbo Build - Northwest Nissans

thats crazy as! i didnt really think people go this far with these cars.
im just looking somewhere around 300whp. what would be the best option?

Not my car....


This guy claims to be making about 440... I've seen the car run autocross... Its wicked fast.... He has to turn the boost down when its not on slicks... It won't hook up on street tires and high boost
http://forums.pelicanparts.com/uploa...1259991531.jpg

there are some people that daily drive at 30psi boost..not on regular gas though...:burnout:

also several above 500whp, including at least 1 over 600whp..

Daily drive on 30psi?!?!? Thats crazy.

A starting point would be maybe, a 3 Bar FPR, a new wastegate, a 3" cat-less exhaust, manual boost controller, atmospheric blow off valve and chips. With just those mods, my kid's car was dynoed at 250 RWHP and 300 RWT (on an 80+F day).

e85.

we are finally starting to get E85 here in california - very slow process

There was a company in the UK that took an S2 engine from 3.0 to 3.8 litres and turbo charged it. There was an article in 911porscheworld about it a couple of years ago i think.

Not sure about the 3.8L part but DIVER944 on the rennlist forums had his 3.2L build in a mag. Hes from the UK but I can't remember if it was 911&PW. His car is called Lil: '89 951S Baltic Blue 3.2 litre-
Jon Mitchell 3.2L engine, SPS ballrace turbo, Vitesse Maf & piggyback, TiAL 46mm WG, Greddy EBC

here's a 3.0L turbo registry they started on Rennlist:
3 Liter Turbo Registry - Rennlist Discussion Forums

Just keep in mind that its all about how much air you *flow* not how high your boost is...

Think about it. Blow hard through a straw. Blow hard through a drain pipe. In which one can you move more air? In which one did you have higher "boost". In which one can you move more air and therefore add more fuel and therefore have more power?

Did anyone read "Maximum Boost" by Corky Bell?

yeah you have a point, but im just talking about the standard piping set up with a stock turbo or a small upgrade of the turbo.

If you are are looking for the "cost-free" ticket to 300hp at the crank, just remove the banjo fitting from the charge pipe and stick a short, tightly fitting, piece of vacuum hose into it, being careful not to block the holes near the bolt head (you may want to glue it in). If the ID of the hose is small enough (<2mm), you will see the boost gauge go up to the 2bar mark, and that should net you damn near 300hp.

Define "cost-free". Does it happen before or after the ka-BLAM part?

LOL. That was good. Ha.

hahaha oh yeah noworries il give that ago tomorrow morning :)

No ka-blam at 15psi, if using good 92 (or higher) octane fuel.

By cost-free, I mean that I think most people would have a short (1/4-1/2") piece of vac hose lying around somewhere. If not, could probably "steal" such a short piece off of the car, somewhere.

If not-want-go-cost-free, you could tap out the banjo bolt and screw in a (2mm ID) carb jet into it, which might cost you a few dollars, or rupels, depending on where you live. You could go higher psi by using smaller jet sizes. But to protect my "reputation" from those who blow up thier engines by doing so, I DO NOT RECOMMEND GOING HIGHER THAN 15 PSI ON STOCK CHIPS. Additionally, I must add that it would probably be a good idea to monitor A/F ratios, and/or install a knock counter.

When I was running with this setup, I was NOT monitoring A/F ratios, and had no issues, other than getting used to having more power - but that thrill kinda fades after a while. And when the pesky little "need-for-speed" issue is back in your face again, taunting you to go over 15psi, please do it "properly". Thank you & good nite. And, what the heck, I might as well add, double H's, while I'm at it.
L8r