Larger intercooler = running lean?

[Jim_rx7]

I have decat zorst, bov,  induction kit and about to fit a large smic.

I will be getting a PFC about June and a remap.

What are the possible implications of running the mods without remap?

[Lum]

mate, if it was my car i wouldn\'t even be running the mods u are without a pfc! back box & filters are usually ok but de-cat tends to lead to boost spike n with no way to add extra fuel to compensate you run the risk of detonation!
det=blown engine!
i\'d defo hold off on the fmic n get a pfc post haste!

[allstaruk]

BANG

Your pushing you luck as it is, fitting the smic is suicide!!!!!!!!

[interloper393]

lol i didnt know you had a decat Jim, but yeah your gunna go Boom soon without a pfc n remap.. get a cat fitted and dont boost until its on, 3k for a rebuilds not nice bud

[Jim_rx7]

The cat has been removed, but I do have the pre-cat still in (uk car) so it isn\'t 100% decatted. I do have a Jap downpipe to go on, but I won\'t fit it until I get the PFC.

So in theory I should be ok??... ?


Why does fitting a larger smic cause issues?

[interloper393]

umm pass lol..

[allstaruk]

A larger SMIC cools the air better, therefore you get desnser air, which means your getting more in so if you have more air you need more fuel, e.g you\'ll run lean.

A

[Jim_rx7]

Alot of other Jap turbo cars I\'ve had you can get away with decatting, putting larger intercoolers on etc and without remapping it\'s ok.

Is it just because the rotarty is so much more sensitive to detonation?

I\'m gonna fit it regardless as the car isn\'t boosting 100% anyway. I\'ll then fix the boost leak and get a PCF fitted and mapped. TBH I don\'t use the car much as is, and just potter to work and back ( a few miles a day ) ... lol.

[strange_days_uk]

piston engine can withstand a lot more abuse.  If you run lean on a piston engine it pinks/knocks but can take quite a lot.  On the rotary if you get preignition you can chip an apex seal, the engine is more sensitive.

your standard ecu will not inject enough fuel as you expand the "breathing" capacity of the engine, so yuo run the risk of det.  NOT NOT good, I would say the next thing you need to do before ANYTHING else is get an Apexi fitted.

[Jim_rx7]

I\'m on the hunt for one!

Until I get one fitted and mapped, I\'ll just potter about off boost.

Saying that, could I not just fit the SMIC without the ducting for it? That way it won\'t be working as effeciantly as it should be, and there will be less chance of det?

Either way, I\'ll be driving off boost.

[interloper393]

Just buy an apexi first bud, base map on these will do all the mods you have safely, then build on that.. dont take the risk of blowing your engine.. altho i`ll giv ya a hand cus it`ll be fun rebuilding it lol

[strange_days_uk]

Well it would be prudent to get the Apexi fitted before doing anything else.  PM Sent !!

[n4bes]

Common theme to the posts here mate, DON\'T DO IT...................

The rx even when set up properly will inject more fuel than piston cars mate, u will have major issues if you under fuel the car.

[Jim_rx7]

Just buy an apexi first bud, base map on these will do all the mods you have safely, then build on that.. dont take the risk of blowing your engine.. altho i`ll giv ya a hand cus it`ll be fun rebuilding it lol

Lol.. that\'s my thinking... rebuilding could be fun!

Obviously, I don\'t want to have to rebuild it!

[interloper393]

a home rebuild costs around 1500 if new housings are needing..