hi ya'll a freind of mine has a 98 12v 5 speed with some mods. i was riding in it this weekend he mashed the go pedal and his egts spiked at 1400* i thought this was a little hot. hes got a 4" down tube and 5" exaust on it. is there any way to bring them down? also this was on flat ground. thanks

 

He can slide his plate back in the injection pump or get a less aggressive plate. Bigger turbo's move more air and cool egts. Increasing the timing can lower egts also I hope he's got a good air intake that can help some too. Really need more details on the setup in the truck

 

The reason that EGT's are high is either that the engine is running rich or the heat is having trouble escaping through the exhaust. He has already opened up the exhaust some(an exhaust manifold would do it more) so it seems like he should focus on the air to fuel ratio.

He needs to move more air or push less fuel. If he is willing to bring down the performance of the truck some, sliding the plate back a little will do the trick. Also, make sure that the AFC is working, otherwise he could be dumping a lot of extra fuel before the turbo catches up. The other way to go would be to move more air. A bigger turbo would accomplish this although it may be slower to spool up. Without knowing how the truck is configured, it is hard to know whether a turbo would solve the problem. If it is a heavily modded truck, the intake system on the engine will be too restrictive and won't flow enough air even though the boost numbers are really high.

With some more info on the truck, it would be easier to point to a certain area to focus on. I tried to give a general outline of the possible approaches but with more specific information, other members could help out with what products and modifications actually work.

 

sorry was in a hurry. he's got a twin ram intake,#4bd plate,370 injectors,and timming is set at 14.5 i think. are trucks are almost the same but i have arp studs and marine head gasket. it hits 42pounds of boost. hope this helps and thanks again for the info

 

I agree with dartmouth about either moving more air or less fuel. 42lbs is a bit much boost for a hx35. I think he would be better off with a less aggresive plate like a 8 0r 10 or upgrading his turbo to something like a 62/12 or 62/14 depending on what he does with his truck.

 

Thats pretty low timing for 370s and way to much fuel for the stock turbo like the others have said.

 

what would be a better timming setting?

 

A #4 plate and the 370s will get pretty toasty with the stock turbo as far as I know.

Maybe try a #10 plate?

 

Ratsun hit it. 14.5* is too low for that fuel level. He can try 16.5 to 18* but the 18* may push the limits of his HG if he isn't careful. Timing, BHAF and a turbo would make it a different truck. The least expensive is timing and filter but then he may buy himself a HG job . I ran 20+*, HTB2, 435's with lazer cut DV's with a stock HG and it held fine. The stock turbo wouldn't like that at all though.

 

hey guys thanks for all the help. now what about a diffent turbo housing?

 

That will help too, (as in a bigger one), but you will lose a little bit of low-end spoolup.

 

sorry to hijack but will a 0 plate get hot with just a straight piped exhuast. nothing else done to the truck its a 180 pump 97