+ 20's what fuel pressure to run?

[Hemidare]

Hey just wondering what fuel pressure i should run with + 20's. I have a AFPR and just want to know a good place to start thanx!

[Clay]

well, +20s are 20% more fuel, so 20% less fuel pressure should be a good place to start.

clay

[Hemidare]

So 44 roughly is where i want to start or a little higher i would say and go down from there! Sound good thanx for your prompt reply!

[GLHNSLHT2]

what are your current mods? with a good exhaust system, and ported exhaust manny you could probablly leave the pressure alone. I run them at 55psi with a 2.2. T2 setup with the ported exhaust manny and no cat.

[Clay]

what are your current mods? with a good exhaust system, and ported exhaust manny you could probablly leave the pressure alone. I run them at 55psi with a 2.2. T2 setup with the ported exhaust manny and no cat.

thats true. With appropriate mods, most computers can handle the extra volume of the +20s.

[Hemidare]

I am running it at 55 psi with the vacuum off. I have a 2.5 inch mandrel bent exhaust and no cat.

[iTurbo]

I'm running two cars with +20s. I have AFPR with them but I run stock pressure. Works great.

The Shelby Lancer is stock TII setup with 3" exhaust and a few other minor things. Omni GLH is '89 2.5 TI, 3" exhuast, NPR intercooler etc..

[turbovanman²]

I seem to recall 35ish psi. 2.5T1's run pig rich with +20's. The computers won't compensate, been there, done that.

[GLHNSLHT2]

a dead stock 2.5T1?

[iTurbo]

My Omni loves the +20s with stock pressure. It's running 2.5L engine with '89 2.5L TI SMEC.

If I had been running stock injectors and someone swapped in the +20s without telling me, I probably wouldn't even notice the difference except WOT. Same with my Shelby Lancer which is using a stock '87 TII LM. Cold startup is fine, idle is great, and it goes into O2 feedback just the same as before.

[GLHSKEN]

I seem to recall 35ish psi. .

Way too low.

[Dave]

Way too low.

That's what I was thinking!

I'm running 50psi static pressure.

I don't have an a/f gauge yet so I haven't lowered it yet. Apparently it's good enough for 19-20psi. Plugs are red as hell.

[turbovanman²]

My Omni loves the +20s with stock pressure. It's running 2.5L engine with '89 2.5L TI SMEC.

If I had been running stock injectors and someone swapped in the +20s without telling me, I probably wouldn't even notice the difference except WOT. Same with my Shelby Lancer which is using a stock '87 TII LM. Cold startup is fine, idle is great, and it goes into O2 feedback just the same as before.

Can't compare LM's to 89 SMEC's,

Way too low.

It might be but as always, best way is go out and WOT it, if the Dawes is yellow, its gold, if not, adjust as necessary but I seem to recall thats what my van liked.

[iTurbo]

Can't compare LM's to 89 SMEC's,

Why not? The original poster didn't state which he was using. I think my experience with the +20s shows that they will work just fine for lots of vehicles out there still using stock cals, even with stock fuel pressure.

[turbovanman²]

Why not? The original poster didn't state which he was using. I think my experience with the +20s shows that they will work just fine for lots of vehicles out there still using stock cals, even with stock fuel pressure.

I know what car he has. I have run my van on +20's with stock fuel pressure and it wouldn't go into closed loop and the green and purple lights on my Dawes never went out. Also have a friend with a stock 89 Daytona, 2.5 T1, stock everything but +20's, same as me, pig rich. I guess some are luckier than others. I believe 2.2's have enough room in the cal to accept +20's, 2.5L's don't.

[turbo xtc]

I know what car he has. I have run my van on +20's with stock fuel pressure and it wouldn't go into closed loop and the green and purple lights on my Dawes never went out. Also have a friend with a stock 89 Daytona, 2.5 T1, stock everything but +20's, same as me, pig rich. I guess some are luckier than others. I believe 2.2's have enough room in the cal to accept +20's, 2.5L's don't.

what would you recommend for 2.5 log boost right now it is running great at 13.5 psi to 16 but at 15 power starts to fall but my a/f never gets under green and the plugs are slightly tanish-brown i'm running stock 27's with cold start out of bmw 535 now or is the log just not moving air

[turbovanman²]

what would you recommend for 2.5 log boost right now it is running great at 13.5 psi to 16 but at 15 power starts to fall but my a/f never gets under green and the plugs are slightly tanish-brown i'm running stock 27's with cold start out of bmw 535 now or is the log just not moving air

It could be the log intake but I would lean it out somemore, your losing power because its too rich.