Gsr help

[Praz Oner]

Hi guys i am new to this site, I am looking for some help.

I have recently bought myself a 93 gsr 1.8t and im trying to get it running mint.

1st problem is when i boost it sputters and backfires alot.. its only running 8-10 psi

2nd problem is when i cold start the car it starts first pop, when the engines warm it slow cranks for some reason maybe a voltage drop since the batteries relocated..

Any ideas??? Thanks

 

[khubner1]

plug gaps?

 

[Ryan38]

Try simple stuff, service work, fuel filter, injector clean, plugs and leads etc

 

[khubner1]

faling those BOOST LEAK! we've had numerous cars come through with bucking etc under load and almost always it's bad plug gap (to wide) or boost leak

 

[Praz Oner]

Thanks guys! going to give it a full service this week, what plugs do you recommend? i am looking at putting ngk bkr6e's in with 0.8mm gap

 

[khubner1]

use those same plugs but regap to .6

 

[Praz Oner]

Damn the plugs made a huge difference. Still cranking over slow when engine at operating temperature..

 

[EVOCPE]

Get someone to hold a multi meter on the battery when you try to crank it, let us know what volts it drops to

 

[Praz Oner]

Sweet thanks will let you know, oh and i got given a evo 3 intake system with evo 3 injectors, would they suit a 93t?

 

[khubner1]

you'll want and evo ecu evo afm and probably yht evo turbo take full advantage of those injectors. bare minimum is ecu and afm to support them

 

[3VOLUTIONIST]

Recommended plug gap for running the maximum boost a TD04 13G can manage? I put new plugs in recently, gapped to .8 if i remember correctly, which I'm guessing is too wide, seems to shudder/backfire a bit on more than 16psi

 

[khubner1]

stock recomended is .8 i've been told .6 is a good place to set it

 

[3VOLUTIONIST]

Looks like I've got some plug gapping to do then!

 

[3VOLUTIONIST]

Got it to run 20psi stable-ish (only got to test to 5k in second because speed limit, will check it on the freeway tomorrow) with a 0.6mil gap. Any more boost and it violently lurches forward at a certain rpm, increasing the boost brings the lurch point down in revs (26psi was about 3500rpm)

 

[blackvr]

^^ Are you sure you are not hitting the ECU's boost cut ?

 

[CLuTZ]

If you could list your mods that'd make it easier for everyone to help you out

 

[evo-gsr]

Sounds like some type of cut to me. Maybe boost as mentioned above.

 

[khubner1]

yep thats boost cut i hit it a few times at 15psi with my boost creeping td04 was scarry first time i hit it

 

[BMGTZ]

26psi....yes it is a forged engine. But arent you now running a stock turbo? if yes it will be pumping a lot of heat

how big is the intercooler?....evo size?

 

[3VOLUTIONIST]

I should probably create a new thread, don't want to hijack this poor guys..
Some info for you guys though:
Forged engine, 8:1 comp ratio, 390cc injectors, GSR AFM, GSR computer, TD04-13G turbo, using a bleed valve because the solenoid was stuffed when I got it, and an Evo sized front mount.
I thought it was the engine leaning out so I got pretty worried it caused some damage when it happened, but I took it on a cruise this arvo and it ran fine on 20 pounds

How can the ECU even sense the boost pressure anyway?? afaik there are no boost pressure sensors