PDA

View Full Version : 600+hp sr20det getting maybe 100hp??? WTF???


1TP
04-08-2008, 08:47 AM
Hi zilvia! I'm new here but been lurking around for months and decided not to even post until I got my s14. Anyways, on with my problem....
The car lacks power like a mofo and runs like sh!t. Black smoke everywhere, feels like its running on 3 cylinders with >100hp or something. On the highway the exhaust note isn't smooth, its choppy and the car shuts off when I stop. I've searched and found similar stuff but not quite like the problems I'm having. It idles o.k for about a minute then shuts itself off. I was running pump gas(93) on low boost on the gt35r. New to sr20det's, help me out zilvia...

Lots of mods on the car:

CP pistons (stock bore)
Eagle Rods
ARP bolts
Calico coated bearings (main and rod)
Hks 272 cams
SuperTech Titanium valves
Supertech Dual valve springs
Greddy Rocker arm stoppers
Mild port on head
Custom manifold
Custom Downpipe
GT35R turbo
Tial BOV
Tial wastegate
Precision large FMIC
Act 6puck clutch
Fidanza light weight flywheel
Precision 880cc injectors (top feed)
Top feed Fuel rail
Aeromotive FPR
Aeromotive In-line 1000 Fuel pump
255lph Walbro In-take
Custom surge fuel surge tank setup
B&M short throw shifter
Microtech LT10 (4 bar)Stand alone ECU
Microtech Hand controller
MSD Dis 4 W/2 step
Bosh Ignition coils
Koyo Radiator
Dual Flexlite slim fans
Tein sTech
Greddy Exhaust

:bigok: Thanks for your help in advance!

godzillarb
04-08-2008, 08:51 AM
Link didn't work.

There could be 100 things wrong with your car, my first guess would be tuning though.

Silvia_S13
04-08-2008, 11:14 AM
yah could be hundreds of things. main guess is tuning. especially since its breaking up when jus cruising on the freeway. it should be most steady/smooth at that point.

you say 600HP, but ur car hardly runs and ur new to sr20dets, how you figure 600?

1TP
04-08-2008, 03:31 PM
yah could be hundreds of things. main guess is tuning. especially since its breaking up when jus cruising on the freeway. it should be most steady/smooth at that point.

you say 600HP, but ur car hardly runs and ur new to sr20dets, how you figure 600?

Its the cft white 240sx. Dynoed @ 622hp on mustang type dyno before the problems.

I'm the new owner :bigok:
http://http://www.youtube.com/watch?v=BOqXILaq6xo

blueshark123
04-08-2008, 03:33 PM
sounds like a boost leak

steve shadows
04-08-2008, 05:04 PM
If it's breaking up when just cruising it's probaby too lean

get a Wideband on it

1TP
04-09-2008, 01:36 PM
Thanks guys! I know its hard to point out exactly what the problem is, I think its the tune also. Will be going into the shop very soon.

xsublimefrekx
04-14-2008, 08:35 PM
i would do a compression test to make sure everything is good. If you know anything about the engine management that is on the car you may want to look at the decel fuel maps. I had a problem with my sr breaking up under cruising.

KA-T_240
04-15-2008, 10:41 AM
check for the fallowing:
Boost leaks
Compression test
Tune/ AFR
Sensors that are unplugged/loose

OfourTHREEfive
04-16-2008, 07:08 PM
If its blowing black smoke that would mean its burning fuel, so that would mean rich which goes along with your AFR.

SHIFT_*grind*
04-22-2008, 09:33 AM
Have you taken a good look at your IC piping? Because honestly, this sounds exactly like what my car was doing after I blew a coupling off while driving. I checked my MAF, coil packs, all of that crap, then felt like a dummy when I saw the pipe hanging off the end of my front-mount :duh:

steve shadows
04-22-2008, 09:35 AM
This is a MAP based system...

did the MAP wiring come loose?

Sil180
04-22-2008, 06:45 PM
I think you are using the wrong piston size. you should used 20thou over sized pistons with a used block. check your engine compression if can't find any boost leakage.

Sil-Eighty SE-K
04-22-2008, 07:15 PM
timing.....?

crzycav86
04-22-2008, 09:46 PM
was it running shitty when you bought it?

Steeles
04-24-2008, 01:50 PM
This is a MAP based system...

did the MAP wiring come loose?


yeah make sure the vacumm line to the map sensor is attached at both ends. my microtech acted like this when thehose came loose once..

i'm jealous I wish I had ordered my microtech with the 3bar map sensor option

TougeLabs
04-24-2008, 08:06 PM
Deff tuning issue....I have heard about guys buying cars tuned from lower elevations and having issues but it has to be severe...Why dont you ask the previous owner maybe he will have some input best of luck

wacerx
04-28-2008, 05:33 PM
Why dont you ask the previous owner maybe he will have some input best of luck

x2 considering the previous owner was a shop i fully back this statement.

TheWolf
04-29-2008, 07:25 AM
Its the cft white 240sx.

There's your problem....

1TP
04-29-2008, 11:55 AM
There's your problem....

Lol...Yea, its been ran. Alot! But I got it for a nice price! The privious owner told me the only change that was made was the CAS. It had a mitsubishi (brand) CAS when it was tuned and since then its been replaced with a Hitachi CAS. Would that matter? I'm not sure if there would be a big difference with the 2 different brands or not. Car is with tuner and thats what he suggested also. Timing is fine, compression test is fine, MAF and all connections were also good. Car just wont rev over 2k. Maybe a bad CAS or just buy a mitsubishi brand.....IDK what the hell is up. I'm new to this... Anyone in the Winston Salem, NC area with knowledge? Yea, I'll pay ya for your time and help! Gas too! 336-837-9181 Tim (I'm dead ass serious).

FusionR240sx
04-29-2008, 08:03 PM
sounds like IC pipe..
mine did exactly what your talking about.
it blew out and put putted around and stalled at stops.
sounded like shit and all.

put it back on and all was good.

Steeles
04-30-2008, 08:27 PM
1tp I'm headed to the shop to take a look at it tomorrow with Mark. though from talking to him I can't readily find a problem. i'm curious about the msd bosch coil setup. but you said the only major change from when it was running "right" and not running was the CAS change. mark said some rwiring was needed in the change? I wonder if something is crossed....

1TP
04-30-2008, 11:41 PM
1tp I'm headed to the shop to take a look at it tomorrow with Mark. though from talking to him I can't readily find a problem. i'm curious about the msd bosch coil setup. but you said the only major change from when it was running "right" and not running was the CAS change. mark said some rwiring was needed in the change? I wonder if something is crossed....

Cool deal man! Any help is appreciated. I talked to about 6-7 different shops about the CAS brand (Hitachi vs. Mitsubishi) and there is no difference at all. They all said it should work the same reguardless of the brand. The original owner said there was a Hitachi on it before and the one on it now is a Hitachi (used). I ordered a brand new CAS yesterday, got it for cheap so if thats not the problem its always good to have extra parts. The MSD and Bosch coil set -up may be fu*kd up? The bosch coils came with the microtech Lt8x. The previous owner tried to replace the old CAS and had CFT rewire it (I dont know why they would need to rewire it but it was done). I thought he might have messed the timing up when he "tried" to replace the CAS but Mark says the timing is dead on. Maybe the CAS is bad? Maybe a bad coil? Or the msd wiring is wrong but the previous owner never mentioned to me he messed with the msd or its wiring. I'm new to this car so......:confused: . I hope you guys find the problem. If you or Mark need anything just give me a call. Thanks again.

Steeles
05-01-2008, 01:29 PM
couple things... first the cars running an older Microtech LT8XS box with the 30psi map. And that MSD box is ancient as well. seems at least some of the problem is the MSD. I'm gonna bring mine up there first of next week to compare a few things. but those are the craziest sounding hks 272s EVER.

1TP
05-01-2008, 05:57 PM
Yea, I love the cams! That microtech systems is gettin replaced by mid summer for a haltech E11v2. Its still running on the 30psi map, tuned with c16 gas... too aggressive for me and my pockets, I dont want anything to do with that map. Mark is gonna retune it for pump gas and 24psi. When you commin up next week? You mean you're bringing your car or msd or microtech sys? Let me know what day you're goin. Thanks for all your help.

Steeles
05-03-2008, 11:35 AM
bringing my car with my microtech. just to kinda compare a few things. we know the tuning history of mine so we can kinda compare base settings and such.