Too much boost!!! Help!!

[Sassan]

So I have a 87 turbo targa wit a fresh rebuild with 1700 miles on it. Did a very nice 1500 mile brake-in. I have upgraded intercooler 3in down pipe and 3in exhaust. Engine is slightly built. I have a free ct26 Godspeed turbo (it works -_-). The problem I'm having is I'm hitting fuel cut at 10-11lbs of boost. BUT I dnt even have my boost controller connected. Is there a way to limit my boost 3 or so lbs or Wat can I do to raise my fuel cut level. I can't track my car if I can't go wot without hitting fuel cutoff.

 

[radiod]

It's not uncommon if you have a very free flowing exhaust and intake to be getting up to fuel cut range. Only real thing you can do is restrict it somehow. Adding a cat will make a small difference, a tail pipe silencer might help as well, but there's not much you can do that is "simple". Being closer to sea level and the cooler winter weather doesn't help either.

 

[Sassan]

So only thing I can really do it get 550 injectors and lex maf at this point huh?

 

[emericaskater285]

So only thing I can really do it get 550 injectors and lex maf at this point huh?

That if you want to have room for a little more power or put the stock downpipe and maybe intake on to lower the boost some, which will also lower the power. Fuel cut is a good thing, but it is such a PITA.
I remember when I first put my exhaust, downpipe, and intake on. The car felt like a monster, then boom fuel cut.

 

[Sassan]

I dnt have any of the stock stuff so I need to find some way to raise my fuel cut or lower my boost levels.

 

[planemos]

You can run a restricting plate at the turbo elbow to downpipe connection. Just get 2 exhaust gaskets for that flange. Then cut a piece of sheetmetal of the same shape and drill the 3 bolt holes. Next get a holesaw and make a 2 inch hole in the center. Put the piece of sheetmetal in between the 2 gaskets and bolt the flange back together. You will be able to experiment with the size of the center hole (make it bigger/smaller). This should keep you from hitting fuel cut until you can get some kind of electronics standalone or whatever in the future. This was my idea that I was going to do with my 2JZ.

 

[Sassan]

Thanks I think I will try this idea n see how it goes.

 

[jonahs_supra]

since it is a ebay turbo i would start diagnosing with that
does it use the OEM wastegate actuator?
before install did you check for binding on wastegate flap?

 

[Sassan]

I got the turbo new and there was no binding at all.

 

[peste noire]

check to see if the wastegate can open all the way. ive had it happen to me as where the exhaust wont let the wastegate open all the way

 

[jonahs_supra]

You checked it when new but now it has some miles on it
I would recheck anyways
Also check for boost leaks
Fuel cut at 10psi is a little low
Then if everything checks out fine there is a few options you can do
1. Fuel cut defender. I do not recommend this without the use of a wideband
2. Lexus afm, 550cc injectors, piggyback and a wideband

3. Piggyback tuner. Again you need a wideband
4. Standalone ecu. Pretty much self explanatory lol

 

[Sassan]

Tested it yesterday night n it open fully at 11,12 lbs of pressure. So I think my fuel cut is just set a lil low lol. But also I found out that my intercooler piping that goes from my turbo to my intercooler has a small rip n the plastic tube so is it possible that this boost leak is lowering my fuel cut point??

 

[Sassan]

I have a wideband. And I just got 550 injectors. Still need Lexus afm. But Wat is a good piggyback? I only want an easy 350 maybe in the distant future 450. N u dnt wanna do standalone cost more than Wat I wanna invest at this point. So Wat a good piggyback?

 

[Dan_Gyoba]

Wikipedia lists Rialto CA as 3,000 ft above sea level, so yeah, I'd say that your FCO is a little early at 10 PSI. If you were lower than 1000 ft above sea level, then that would be closer. Still, at about 10 deg C (50 F) that's not far out of line at all, probably within tolerances for stock injectors.

For 350WHP, the Lexus/550 with an AFPR would probably get you there without a piggyback. I'd probably add an AFPR for gross fuel control, and upgrade the fuel pump to make sure that you don't starve it. A wideband is a good idea if you want to play with that at all. An HKS VPC or APEXi Neo coupled with a 57 trim turbo upgrade and decent exhaust could probably get you to 450.

 

[Sassan]

i have a upgraded fuel pump just not installed yet waiting till i get my lex afm. i have a good exhaust and so forth i also have a ct26 that is a 60 trim as well sitting around waiting for well my supporting mods to be put on. i also have a ffim that my friend gave me. worked great wen i took it off his 7m before he crashed it -_- so all i waiting on is a lex afm and a piggyback of some kind
i have:
550 cc injectors
upgraded fuel pump
ct26 60 trim turbo
ffim

 

[jonahs_supra]

Just get yourself a safc2 for a piggy back
Also a adjustable fuel pressure regulator wouldn't hurt