let me know if you guys would rather see sae or uncorrected numbers. had no time to tune. put it on the dyno and away i went. this is with an srt-green on e-85 (technically e-70 right now). need to get a friend to help me get my afr's/timing where i want them. hard to run the dyno, drive it, and try and check wideband and scangauge all at the same time. running richer than i'd like it to be for most of the pull. runs 7 & 8 i lowered the boost a bit because of some knock in the upper revs. can srt4's get rich knock like dsm's? at the top end my afr's were in the 10's on a gasoline calibrated wideband. I am still on my stock clutch at 54k. i don't think it slipped on the dyno.
Last edited by quicktalon11s : 04-10-2009 at 07:36 PM.
lets see. i'll start with fuel. walbro 255hp intank w/bottleneck fix to an inline bosch 044 motorsports pump (all -6 aeroquip pushlock hose) to the stock rail with a -6 fitting welded to the end to a fuel lab fpr and returns fuel back into the canister via a second bulkhead fitting. 900cc fic injectors running at 58 psi with fpr vacuum line tee'd into the red line (boost only source). turbo is an FP srt-green 47lb/min big wheeled stage 3 that i self ported the turbine outlet from the turbine wheel to the outlet and matched it to my cti stainless stage 3 o2 housing w/custom copper gasket i made out of .050" copper to mate to turbo. 3" MPX single exit exhaust with a cat from the o2 housing back. agp s-3 wastegate actuator. all intercooler pipes from ptp w/a hks bov (cuz stock bov leaked boost like crazy). ED superbeast intercooler, and Mopar CAI. Mopar wires and NGK 4306 plugs gapped at .035". SCT PRP, hallman MBC, errorfarce scan gauge, aem wideband. That is all of the relevant mods for power that I can think of.
I boost leak checked it to 30 psi and fixed all leaks except for what i believe to be fairly bad t-body shaft seal leak. oh and the ptp cold side pipe grommet leaks a bit too. other than those, i "should" be pretty boost leak free. on the first 2 dyno graphs, boost would spike 28-29 psi for a bit and then fall fairly quickly to 25psi and hold there. run 6 i twisted the hallman a bit and got 30psi falling quickly to 25psi. I think a ptp spring in the wga and a throttlebody that doesn't leak like a sieve would allow the boost to hold a little higher. I'd actually prefer to keep it at 27psi all the time, but i'm not sure the 47lb compressor can do it at or near redline. I'll also have to keep testing the fuel to see when it switched to e85 from e70 to see what kind of difference it will make if any. most other mods are suspension/brakes based. TCS will be on soon too.
Looks good! SRT 2.4L engines do make a high end harmonic that tends to set off the knock sensor.
I'd be embarrassed for you to see the fuel curve.: It wasn't very consistent going from 12-1 to 11.5-1 to 10-1 afr's at redline. and my timing is a bit aggressive for the boost i'm running. I'm kind of picky about it being perfect, but a 7 month old daughter trumps car time.
On a side note, could a diablosport handheld be used to datalog on anyones srt-4 or just the one it is matched to? i would really like a datalogging tool that would datalog everything including my wideband o2 without having to tap into the factory wiring harness just to get the inputs. would make adjustments soooo much easier/faster.
WOW, man, just WOW. The power level isnt insane, but it is sooooo damn broad, i mean you are making 400+ horsepower right to redline, I bet you had another 300-400 rpms before it truley would have dropped off, and doing so at the track or street means your next shift will put you right around 4500 or so, right back into 400+. That sucker is sick.
I will say though, dyno aside, I would have thought at 30psi + E70 you would have cracked the 500wtq mark with that turbo. How much timing are you running? I know you ported it yourself, but did you port the exhaust runners at all leading up to the scroll area? I think thats were FNF and DCR have found some great hidden power in the S3 manifold, that and the crappy internal gate as you have witnessed just sucks staink hairy taint, that turbo can hold 27-28psi right to redline from what I have been told from FP with an external setup.
Either way, leaning it out a bit near redline and and maybe fixing some boost leaks I can see plenty more power in that sucker. You have a solid low 11 second powerband there, nice work
WOW, man, just WOW. The power level isnt insane, but it is sooooo damn broad, i mean you are making 400+ horsepower right to redline, I bet you had another 300-400 rpms before it truley would have dropped off, and doing so at the track or street means your next shift will put you right around 4500 or so, right back into 400+. That sucker is sick.
I will say though, dyno aside, I would have thought at 30psi + E70 you would have cracked the 500wtq mark with that turbo. How much timing are you running? I know you ported it yourself, but did you port the exhaust runners at all leading up to the scroll area? I think thats were FNF and DCR have found some great hidden power in the S3 manifold, that and the crappy internal gate as you have witnessed just sucks staink hairy taint, that turbo can hold 27-28psi right to redline from what I have been told from FP with an external setup.
Either way, leaning it out a bit near redline and and maybe fixing some boost leaks I can see plenty more power in that sucker. You have a solid low 11 second powerband there, nice work
I don't see not being able to make 440 or so to the wheels on e85 (not e70) with the t-body leak gone, leaning out the top end, richening up the initial spool, an using more reasonable timing numbers. timing was too high and knocking a bit in a few places. not enough to have me worried, but enough that i'd like to eliminate it. i'd say a good portion of my timing map from 20 -27psi is in the high 20's to the low 30's. too much for that much boost IMO. worked well at 25-27psi though. I'd say my numbers are ok. i don't think many people would see 500ft/lbs of tq on this turbo and if they did it would be on very high octane leaded race fuel like c16, q16. they have alot more info about the turbo and power numbers on fp's website. (Forced Performance Turbochargers) buschur and curt brown both made similar numbers to mine and i'm willing to bet on race gas. especially curt brown. he is a c16 whore! lol. I absolutely hate external gates on everyday street cars. too much plumbing to put back into the exhaust and too noisy dumped.
i only ported from the turbine wheel out. i really didn't feel the need to port the runners as they are a decent bit larger than the cylinder head ports. after somewhere around 5-6 hours of porting cast iron and breaking my die grinder in the process, i said fuck it!
thanks for the compliments. i really think a heavier wastgate spring will help the internal wastegate do a bit better. sucks i can't put slicks on the car anymore. won't fit over the wilwoods. i have a feeling my talon will be taking some attention away from my srt for a while.
EGTs with E85 and E85 blends tend to shoot WAY up there if you are on the lean side. I would imagine you are already at 1700°+ at 12.5:1 (on a gasoline calibrated WBO2), based on some of my observations.
EGTs with E85 and E85 blends tend to shoot WAY up there if you are on the lean side. I would imagine you are already at 1700°+ at 12.5:1 (on a gasoline calibrated WBO2), based on some of my observations.
Damn, whats the main reason? The higher burn rates? Does the same go for methanol?
With ~100+ octane mix I'd think you could run ~12.5:1 with MBT timing.
i would like to be around 11.5-11.7-1 all the way across the board. I could run leaner, and did for a while at 24 psi. i spike 28-30psi and drop to 25 and 12.5-1 seems a little lean to me at that boost and the timing i run.
i would like to be around 11.5-11.7-1 all the way across the board. I could run leaner, and did for a while at 24 psi. i spike 28-30psi and drop to 25 and 12.5-1 seems a little lean to me at that boost and the timing i run.
Then maybe your timing is too high. I would think MBT for your E70 wouldn't be as high as it would for Gas.
Leaner A/F and less timing would seem to be a beter combo as long as EGTs are in check.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
plopped her on the dyno for a few pulls today
: It wasn't very consistent going from 12-1 to 11.5-1 to 10-1 afr's at redline. and my timing is a bit aggressive for the boost i'm running. I'm kind of picky about it being perfect, but a 7 month old daughter trumps car time. 
Linear Mode
