Redtop SR breaking under boost

[Dalton_bmx]

Okay so when in gear the car will break under boost and it seems like it completely dies until i let off the throttle then it is back to normal.
It will not let me past 4k rpm's when in gear but in neutral it is just fine. Idle is good on it, 02 is good and MAF is good.
Here is a video of what it is doing
SR20DET breaking under boost - YouTube (http://www.youtube.com/watch?v=vwfHjXlX5_E&list=UUCPjEeLh8Jd07ryKGXC1sww&index=1&feature=plcp)

[KiLLeR2001]

Need more info. Did it ever run properly? Did you do anything to it recently? Whats the spark plugs you're using and what are they gapped to? Whats the engine management, is it all stock?

I'd say check for boost leaks or potential coil pack issue.

[Dalton_bmx]

Well the guy I bought the motor from had the same problem with it. Not sure on the spark plugs, id have to check but I know they are NGK. I have a 2nd set of coil packs and still no difference when I swapped them. And the motor is all stock except for the T28 and the manifold.
To me it seems like the fuel is being cut right before hitting boost.

[90pearlz]

Might be fuel cut, t28 on redtop 370's is probably maxing em out. Knock maybe too. Any codes in the PCM?

[nsr20detpowered]

Ya check the gap on your spark plugs. I had the same problem after I turned the boost up the first time. If not its the MAF, Im using the SR MAF and whenever mine starts breaking up I just spray it with MAF Cleaner

[Dalton_bmx]

Might be fuel cut, t28 on redtop 370's is probably maxing em out. Knock maybe too. Any codes in the PCM?
I have not checked, but i will tomorrow

Ya check the gap on your spark plugs. I had the same problem after I turned the boost up the first time. If not its the MAF, Im using the SR MAF and whenever mine starts breaking up I just spray it with MAF Cleaner
I will try this too

[ultimateirving]

boost leak like killer said, and/or spark issue, whether ur plugs are gapped too much or ur coilpacks are jacked.. also what is the purpose of the safc 2? are u running a different maf/injectors/turbo/ what?

for a stock sr you wont need that, shoot most everyone says not to use them because they really can mess things up.
with a stock sr the right plugs are bkr(e)6 i believe gapped to like .028, use the copper if u can.

hope that helps, let us know more of what you have done

EDIT : posted this kinda late, after all the replies, and after reading more, i really think either u have a boost leak, or ur spark gap is messed up. and get rid of the safc with stock sr.
i ran mine with t28 on the 370cc's up to 12 psi for about a year and it didnt give me any trouble(i have a walbro fuel pump, which should be an early upgrade if you dont have 1). I havea wideband so i can watch my afrs too and it wasn't leaning out at all.

[Dalton_bmx]

boost leak like killer said, and/or spark issue, whether ur plugs are gapped too much or ur coilpacks are jacked.. also what is the purpose of the safc 2? are u running a different maf/injectors/turbo/ what?

for a stock sr you wont need that, shoot most everyone says not to use them because they really can mess things up.
with a stock sr the right plugs are bkr(e)6 i believe gapped to like .028, use the copper if u can.

hope that helps, let us know more of what you have done

EDIT : posted this kinda late, after all the replies,

I have tried adjusting the tps sensor but that didn't do much, and after I hooked the safc2 up and the idle became alot better after I set it to 6 in and 6 out. but I'll probably end up buying some new plugs tomorrow and trying that out, thanks for your help!

[90pearlz]

Yeah SAFC advances timing so be very careful when using one. They should be used strictly for very slight adjustments. My guess is knock especially if your advanced and low on fuel=knock city. I had the exact same problem with a different platform (mk2 mr2). Factory knock sensors were a huge fail in those cars. Replaced with a GM sensor and no more problems. Your problem sounds very similar, but definitely check for boost leak first and ecu codes.

[Dalton_bmx]

Yeah SAFC advances timing so be very careful when using one. They should be used strictly for very slight adjustments. My guess is knock especially if your advanced and low on fuel=knock city. I had the exact same problem with a different platform (mk2 mr2). Factory knock sensors were a huge fail in those cars. Replaced with a GM sensor and no more problems. Your problem sounds very similar, but definitely check for boost leak first and ecu codes.
I think im probably just going to take the safc out until i get some bigger injectors and put on my z32 maf

[huffandpuff00]

boost leak!!!!

[Dalton_bmx]

boost leak!!!!

Im really hope it is!

[s13turbohatch]

I was going to buy an safc 2 but I ended up saving more to buy nismotronic, very happy I did.

[Dalton_bmx]

No boost leak

[90pearlz]

knock knock

[Dalton_bmx]

The ecu was giving me error 12 so Maf, but I have tried 3 different mafs and I get the same code

[90pearlz]

Check all the wiring for the MAF. The connector and or wiring could be iffy, really common. Are you using a SOHC MAF or SR MAF or what? But MAF codes do come up when there are other things goin on. Your T28 needs a different MAF like z32 etc... Most likely too much flow for that MAF.

[Dalton_bmx]

Check all the wiring for the MAF. The connector and or wiring could be iffy, really common. Are you using a SOHC MAF or SR MAF or what? But MAF codes do come up when there are other things goin on. Your T28 needs a different MAF like z32 etc... Most likely too much flow for that MAF.
I have the SOHC maf in it and its not the harness because i just bought a brand new one. I have a z32 maf but everytime i wire it up and set the safc2 to the settings it never seems to work.

[Nicelyphe]

How much boost? What fuel pump?

[Dalton_bmx]

How much boost? What fuel pump?

7psi and walbro 255

[ultimateirving]

7psi and walbro 255

with these two, he is not maxing the stock maf or injectors with a t28.. what is ur plug gap and heat range plz?

[90pearlz]

Word, low boost and walbro shouldnt max out the injectors, but pretty sure T28 deserves a different MAF, Im just trying to help a brotha out. Interested to know what the problem is...OP is using a SOHC MAF I'd say that's no good and he should try to get that Z32 set up properly. Disconnect that SAFC and see what happens, maybe its as easy as that.

[Dalton_bmx]

with these two, he is not maxing the stock maf or injectors with a t28.. what is ur plug gap and heat range plz?

have not checked the gap yet but its not running hot or anything according to the cluster. I havnt hooked up my temp gauge yet

[ultimateirving]

Word, low boost and walbro shouldnt max out the injectors, but pretty sure T28 deserves a different MAF, Im just trying to help a brotha out. Interested to know what the problem is...OP is using a SOHC MAF I'd say that's no good and he should try to get that Z32 set up properly. Disconnect that SAFC and see what happens, maybe its as easy as that.

i know what you mean. Sohc maf can be used with s13sr if wire properly, safc should not be needed at all for his set up and likely could cause more issues.

[Dalton_bmx]

Word, low boost and walbro shouldnt max out the injectors, but pretty sure T28 deserves a different MAF, Im just trying to help a brotha out. Interested to know what the problem is...OP is using a SOHC MAF I'd say that's no good and he should try to get that Z32 set up properly. Disconnect that SAFC and see what happens, maybe its as easy as that.

I disconnected it today and it wouldn't start whatsoever so hooked it back up and then it wouldn't start. After all that, then the injectors quit sending gas until until i sent them a 12v manually by touching them with a testor

[90pearlz]

So solely disconnecting the SAFC wont do it. It is spliced into wires that control functions of the injectors/pcm signals etc... I dont know exactly how or what it is spliced into to work properly, but what your gonna want to do is keep it disconnected but find out whats up with the wiring. Like what needs to be reconnected now that the SAFC isnt in the middle. Find all the wiring that is from the harness and splice it back together.

[ultimateirving]

yea, try to find a write up of how to install it, and follow the steps backwards to remove it. this way everything is wired back up to stock basically.

[Jasonx63]

when you disconnected the safc does your fuel pump prime? if not check grounds and make sure they're all corrected and also check the relay that is by the ecu because with a WS harness one of those relays isn't needed and causes the pump not to turn on and as for the boost problem check for the intake tube collapsing a buddy of mine had that problem as well if it doesn't have the spring in the tube chances are that's your problem.

[jvega]

Did you rewire your harness to use the SOHC maf? If so, maybe re-check those 3 wires.