MorngWoodStewie

I have the sos in tank fpr, wire kit an 255. And it starts to lean out to 12.2 at red line. (Tail sniffer)

..... Hmmm decisions....

MorngWoodStewie

I should actually probably be more concerned with this ^^ thnx for the input.

s2000Junky

Tail sniffers (when you can get a proper reading on our car) show a consistent .5 leaner then actual due to the pick up point vs a wideband sensor at the TP or header collector. So factor that in.

MorngWoodStewie

Ya I'm tracking, I have a aem in my TP to and I watch it and it's richer at like 11.8's or better. Mijae brought up a good point. I could re tune and up the whp a lil more but without solid pressure I don't think it will be a solid gain and ultimately probably less safe. I'm gonna hold off on the re tune until the fuel system is upgraded to return system.
I hate to keep saying SOS says this and that but I feel they show some solid figures for if and when to upgrade as well. Wish I had that AFR plot cuz it does start to drop off. It is consistent tho. But with a mostly OEM replacement and stock return fpr it should be just as constant without dropping off.

s2000Junky

Yeah, I have no experience boosting a DBW model so its hard for me to argue anything related to the returnless system. Enough people in here do have experience with these though. The current c38 Kraftworks stage 2 kits put many of the DBW cars in the low 400's whp though, so I thought that was more approaching the limit of about 450whp before needing to go returnless. All but a few lucky guys or those running E85 on a supercharger would get to that point. Not every car/set up/condition is 100% controlled though, so better to air on the safe side if any doubts.

Singh_snisen

my buddies car has 500whp on e85. Stock fuel lines and stock motor. It's a time attack car only for the past year. Only prob he has had is cooling and the tensioner on Kraftwerks kit getting loose ( he used red hi temp tread locker too) and the bolt For the tensioner actually fell completely out causing the belt to snap on track. Scary.

Mijae007

Yea i veered on the side of safety and went return on my ap2 too. It came out to $8-900 and is adding up quicly among all the other things ive been buying lately but i feel its one of the more pertinent parts to my build than some of the other upgrades i have done. At least this way no matter how much power or boost you want to push youll know fuel wont be an issue.

MorngWoodStewie

Should be pretty straight forward. Did u have to drop the tank Mijae?

Thnx for all the input guys, I think I'll feel better on 92 once returned, lol....Or is that a pipe dream?

King Tut

My DBW made 500 whp on the returnless fuel system.

MorngWoodStewie

Return or returnless system?
Ap2//ap1?