HarrisRacing

Search my posts they are all on here including the build thread. 8374 is an incredible turbo for rb26

I see that this dyno is in question. On my previous post you will see new garrett -7 turbos (extremely similar to N1's) on my RB26 car which is a stock engine with greddy downpipe, HKS hi power exhaust, and intake pods on 18-19 psi boost. We are making the exact same HP at 5k and the curves look VERY similar aside from your max power. I find hard to believe that this is a stroker engine on those turbos. It's either a stroker on -5's or is a really healthy high-flowing 2.6 on the -7's (which I find more believable). Check your stroke by running a rod in a spark plug hole and measuring high and low of the stroke while you roll the engine to know for sure.

I had a similar setup (except the .92 IWG) and would make 20 psi at 3600 rpms if I punched the car from 2k in 3rd. 30 psi before 4k rpms. Stroker 2.75L on new N1 block and stock bores. Almost same power on pumpgas.

My New R32 GTR Stock RB26 Stock dumps Greddy downpipe R34 GTR Intercooler Garrett -7 turbos Intake Pods 17 psi boost (looks like cut on top end) Same dyno as used on my old car 93 octane pumpgas (USA) Dynos start at 10 psi and move up from there.

Oh and I want to qualify something in case someone dug any of this up from the past in this thread. GTR's are pretty hard to come by in the states and I went off the deep end with my build. My car showed up with a rod knock and I didn't really get to experience the factory twins in their stock form. I went straight to 2.75L stroker and BW 8374 EFR IWG .92 turbo on a 6 boost manifold. Well during my build I had the typical accusations of "American Horsepower" which bothered me and my car ended up running about 128 mph in the 1/4 on pumpgas and 93 octane. On our dyno the car would typically put around 575 whp down at around 19-20 psig boost. Then I tuned it on E85 with the new ECUmasters EMUBLACK and the car made 740 whp and 615 wtq at 30 psi tapering to 25 or so on topend...again I think there were neigh sayers about it. I shortly thereafter crashed the car before I could get to the track and prove the new MPH (and run my 9 second pass). Rest assured, I still have the car and the drivetrain is still good (foreshadowing here). Anyway, fast forward I just picked up another R32 GTR. I spent the day checking it out and going through it. It has an exedy hyper single clutch, stock RB26 with N1 oil and water pumps (don't worry, I know), some filter pods, brand new Garrett -7 turbos, R34 intercooler, Greddy downpipe, HKS super Dragger exhaust. It was running STOCK boost at 10 psi and I'll be honest felt pretty dang laggy to me coming from my other car. Well I put the car on the SAME DYNO here (mine) and started turning up the boost and checking AFR's today. Here are the results and the car got MUCH more fun to drive with the increased boost from 10 psi up to ~17 or so today. Looks like I need to pull the plugs and gap them because it broke up right at the top on the higher boost runs (or there is an AFM limit on this ecu?). I don't have much experience with stock RB26 or stock format twins, but the car pulled very nicely on the street (once it get spooled up). It goes to show that a stroker and 8374 EFR completely crush the pumpgas results from my other car.

Sorry guys here are the results. Tapatalk didn't let me upload.

These are my old pumpgas results on 8374 IWG with nothing more than changing cam settings (increased overlap).

Plot twist - Made a deal on this. Motor runs well. New -7 turbos, new exedy hyper single clutch, intakes, exhaust, new HKS hipermax coilovers, stock interior, stock paint (not perfect, but workable), perfect dash. No wrecks from anywhere I can tell. Also comes with new in box Haltech platinum PNP. Getting excited! Found it local just about when I was getting the GTS-4 put back together. I will say the -7 were a little more laggy than I was expecting. I guess stroker + EFR has totally spoiled me. Sorry apparently had something on my camera lens. Oh and the car was super dirty from sitting in a warehouse for months.

Sure. Stock cadillac ctsv makes 485 whp on this dyno. Stock focus RS mashes 318 whp on this dyno. But it's inertia so mine looks like it spools late. I also live AT sea level. Was like 5 C in shop that night so cold dense air.

GTR chassis is pretty much bent in half. All the GTR stuff into GTS4 as full caged track car. Super widebody though is the plan.

Been awhile... But I'm coming back to life slowly. 2 cracked vertebrae are definitely in there. Back brace and very light duty for 2-3 months, but no surgery needed. I was extremely fortunate (thank God). Good news is I picked up this beauty local. Gts-4 that needs a little work but he has all the parts to put it back together save for a hood and front bumper. Oh and I bought my car back from insurance! It's destiny is the widebody gutted caged racecar I should have built in the first place! Things to look forward to gentlemen. Less weight, more grip, safer car!

Now I'm I the hospital for the flu...yes with a broken back. This is incredible pain!

And now I'm sick with a cold on top of this! Coughing is pure torture!

Notice there are NO brake marks in the picture at the end of the road... I'm not going to talk about what happened yet but seems throttle stuck and I had no brakes at all.

Thinking...time attack. Maybe the only thing the wife will be on board with. I won't be doing any physical car work for a couple months at least.

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She had a good run... another classic to the big racetrack in the sky. Miraculously survived the crash with only 2 fractured vertebrae.

New results now that I'm on E85. 2.75L stock bore (86mm) BC stroker (79mm stroke). BC SS valves, valve guides, retainers, springs Tomei Poncam A's Hypertune V2 intake 6 boost manifold for IWG Borg Warner 8374 EFR turbo .92 IWG on turbosmart actuator ported head ID 1300x injectors (nearly maxxed) 2x 460 walbro fuel pumps with 3rd as a lift pump to the sump ECU masters EMU black LS2 DBW TB the low 7xx runs are 26 psi tapering to around 24 the 740 run is 30 psi tapering to around 24-25. I have added 5th gear spoolup log because this is an inertia dyno and falsely makes this setup seem laggy. boost is all in at 3800 usually in 3rd gear. Now for the crazy stuf...STOCK intercooler, STOCK trans, 3" exhaust.

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I guarantee this car has high 130's if not mid 140's in it. It is flat out scary to drive...recall I ran 128mph on pump 93 (your ron98) on 18-19 psi boost in the 1/4 and it pales in comparison to how it is now. It is an absolute ANIMAL...

Boom. Check them digits out. Sucker woke up at 30 psi in the midrange. 26 on top.

106k tonight...Super cold dense air. Just turned it to 30 in the midrange and 26 on top...BEAST.

Boom. Gapped these BCPR8ES plugs down to .021" and fixed the misfire totally. These are back to back pulls from 22 up to 26 psi boost! Yes through a stock intercooler and through only 3" exhaust with a .92 IWG 8384 EFR. Should be noted it's like 37 deg F in the shop tonight. I can't wait to drive it. This crushes my old numbers. These ID1300s are almost maxxed though.

Intake 6 deg advanced. Ex 4 retard. I have tried a few different settings but it always likes 10 deg of overlap the best. Turbo comes on strongest there and makes best overall power band. Did everything from no overlap to 20 deg overlap...10 is best but there are good gains in the 6-10 range if you are worried about idle quality. Also 8 deg intake advance and 2 deg ex retard made similar power. Power drops over 10 deg though. It will hit 700 whp tonight. I regapped my bcpr8es plugs down to .020" to fight high boost breakup. Yes turbo is really spinning but it's 41 deg F here today so it's still relatively low rpms to move the air.

Wow. E85 numbers. Need to change plugs to go over 24-25psi without breaking up, but I think it actually has 700 whp in it on 75% ethanol! I've got turbo left...only 106k rpms on the gauge.