EGTs skyrocket with a 50 shot and green

[DSMkid14]

ok, i've got a pretty good setup. my head is stock except for the ss valves; i've got my bottom end built with weisco pistons, and eagle rods. i put 428 hp down when it was dynoed and this was on c16 and 25 psi. i have a green and a 92 awd eclipse.
my question is i want to put a 50 shot on top of that and i've done it, but my EGTs skyrocket to 950c +. what can i do to keep my egt's low. when i sprayed it, i was running 20psi. i've got an NX wet kit.

thanks for the help in advance.

 

[Hal]

Most likely your fuel system can't flow enough volume, so you're going lean... causing the high egt's.

Install an fuel pressure gauge and see if the pressure drops while "on the bottle".

Hal

 

[DSMkid14]

i'm sure that i'm giving it enough fuel. i have a supra pump wired up for 12 volt operation and it flows like no other. i think my problem is related to timing. i was reading on another forum and ppl said that egt's directly corralate with ignition timing. don't know if it's what i'm going through but i've been looking for a way to get this setup to work. i'm just stumped at the moment.

maybe i should list all my mods.

hope this might shed some light on things.

FP Green Model turbo
supra fuel pump
720 cc injectors
40 mm tial wastegate
extreme o2 elimanatior
full 3" exhaust from downpipe to tip
AEM stand alone
denso iradium plugs gaped at .0300
Magnecore 8mm wires
Huge custom Spearco fmic and piping
crushed 1g BOV
SS valves
HKS 272 exhaust, 272 intake
Weisco pistons 8.5 compression ratio
eagle rods
knife edged crank
ARP head bolts
Mitsubishi 4 layer metal head gasket
custom 3" intake
2g maf

i think that's it, pretty sure i'm not forgetting anything. If I didn't state it then it's stock. If some can help, I would greatly appreciate it.

 

[Hal]

Let's put it this way... if you don't have a fuel pressure gauge, you're just "guessing".

A Supra pump is plenty, but when wired for +12vdc it can over power the stock fuel pressure regulator and eventually the regulator will fail.

How old is the fuel filter?

Did you use a Supra pick up sock or did you re-use the DSM one?

The Supra pump will draw enough to make the stock DSM sock collapse... causing you to go lean.

I suggest you install a gauge... running N2o requires good fuel delivery... and if you don't have it... BOOM.

Based on your symptoms, it's unlikely your high EGT's are timing related.

Hal

 

[HighPsi91]

As HAL has suggested, you really need to know what your fuel pressure is doing... for a couple reasons.

1) The jets that are supplied in any given wet kit are chosen with a specific base fuel pressure in mind. If your base fuel pressure is lower than what the jet combination was based upon you will lean out with the nitrous. This is due to the fact that you will in effect be adding too little fuel.

2) You really would need to be able to watch/log fuel pressure as your driving.. which is tough. But if you can then you can watch to see if you are experiencing a pressure drop when the nitrous is used. In this case your pump is too small or as previously mentioned you may have other issues in your fuel supply.

I would suggest giving JEGS a call and ordering their 100psi fuel pressure gauge. Drill and tap an 1/8"NPT hole on your fuel rail and find out what your base pressure is. I usually go one step further and test the response of the regulator as well. You can do this by hooking up a small air pressure regulator to the vac/pressure port on the FPR. When you add 20psi of air pressure your fuel should increase by the same. I would test all the way up to 25psi or whatever your highest boost would be. Make sure your fuel pressure responds correctly. This test will not indicate a fuel volume problem but its the best way to make sure your fuel pressure regulator is giving you linear fueling. Making sure that fuel pressure responds correctly is very important when using nitrous.. since fuel delivery is supplied mechanically via a static orfice. Hope that helps a little.

 

[DSMkid14]

thanks guys for the help. looks like i'll be asking for a fpr for christmas. The car still runs like a bat out of hell on the turbo, but there's this one guy with a a cobra that sprays and he says i will never beat him. i just want to wipe that damn smurk off his face at the track when it opens.

again thanks for the help and i'll keep u updated.

 

[v8slayer]

If you still have that stock small rubber fuel line from the filter to the rail your problem is apparent.

I know from testing that the major restriction in our fuel systems is the rubber fuel line section and filter.

Look how small the hole in the end of it is compared to the metal line from the tank to the filter.

Here is a quick cheap fix with out doing the whole fule line AN-mod.

Get the following:
4' AN-6 SS neo line.
1-AN-6 90 degree hose to male
1-AN-6 45 degree hose to male
2-AN-6 hose to male couplers
1-AN-5 to AN-6 adapter , male on both ends
1-AN-6 male to AN-6 blunt threaded end with o-ring.
1-K+N billet 06 filter
1-AN-5 flare collar

Now cut your metal line down by the cross member and slide on your #5 flare collar and flare the end of the line to AN-spec.
Useing your adapter connect your hose to it.
Run the hose up to the bottom of the filter location and cut it.
Put a coupler on it and join it to the filter.
Connect the 90 degree fitting between the filter top and hose and run it to the rail cutting it with a little extra for engine rock.
Put the 45 degree fitting on the end of the hose.
Tap the end of the rail to except a 06 ORB fitting with a viton o-ring and insert the threaded end into the rail.
Now connect the 45 and fitting.

I know this is vague so go to the Stevetek site and merge my cheap directions with his full system and you'll be fine.

Now your supra pump will work best.