BPG

Ive been told that when I replace the downpipe and CAT with a full straight through system on my 3rd Gen twin Turbo I'll have to up the fuel a little to make sure it doesn't run to lean. How can I up the fuel? Would I have to buy another ECU or can I adjust the original one? If I need to get a new one could you sugest which one to get.

Thanx

BNA_ELLIS

BPG to be safe yes it's advised that you add more fuel. if you just do the downpipe and back box you would be ok but a full system is gonna be very loud, you may have boost spike issues too yet not every car is the same. If you want to increase the fuel you will need either a piggback ecu or a replacement ecu. Most of the us guy's in the uk tend to go for the apexi power fc approx £650 and the commander is approx £200
You don't need to have it tuned if you don't want as it comes with a pre-programmed map already. Where abouts in the UK are you, and do you know about fduk ??

Rgds

Brian

skunks

as long as your boost is at 10psi, youll be fine on a stock ecu. but with a straight pipe exhaust system, you will not be at 10psi boost!

with restrictor plates and a manual/eletronic boost controler, you should be able to control it.

ttpowerd

I don't know how well you will be able to control the boost creep/spikes without porting the wastegate as well. If you go for an aftermarket ecu then I would recommend the Apexi power fc which allows a lot of room to upgrade more. Good luck and keep a watchful eye on the boost gauge (hoping you have one)

BPG

Thanx guys, The Apexi looks good and sounds good too. I'll look in to that. What sort of hp/psi increase would I be looking at with the exhaust, down pipe and Apexi unit? Will these mods prolong the life of the turbos? I want an intercooler aswell but a bigun in the grill. Would I have to replace the radiator with a thinner one? Sorry about all the questions but I'm a rotory virgin


**Will the exhaust flame?**

BNA_ELLIS

where in surrey are you ?? I live in croydon

if you have complete exhaust you expect (depending on product) approx 45 bhp increase. Hard to determine psi increase as you will be spiking with boost controller to manage this. If you wanna start messing around with frount mount intercoolers aswell no you don't need thinner radiator but you do need, upgraded fuel pump, fuel regulator maybe bigger injectors, and it would also seem that all these mods would be a bit of a waste with standard induction also. Yes you would have flames with straight through exhaust.
No these mods will not prolong the life of the turbos. The downpipe will get rid of heat quicker from the area where turbos are so this will help, yet standard turbos will only have to deal with 10 psi with the mods you will be having you will have boost spike to approx 15-16 psi above there reliability range.

rgds brian

BPG

Im from Byfleet.

How would I stop it from spiking? If I do this will it cause damage?

BNA_ELLIS

yes it would. do you own a black rx7 and was around west byfleet on sunday at approx 15:00 ??
Our rx7 group had a meet in Guilford that day and someone was spotted you by any chance ??
Rather than going gun ho straight off with exhaust and stuff first how much do you have to spend on mods ?? what kind of mileage does your engine currently have ??
do you have a boost gauge ?? and is your engine in good working order with no faults ??
all these are important before any mods take place.

rgs

Brian

BNA_ELLIS

a black rx7 at weybridge not west byfleet sorry.

rgds
Brian

Wade

iTrader: (1)

Buying a Power FC without tuning it wouldn't make sense, the stock ECU delivers more fuel than the Power FC base maps. Use a stock ECU and keep your boost below 10 psi or if you go with a Power FC, get it properly tuned. The bigger problem you'll likely have regardless of ECU is boost spiking or boost creep, this should be your real concern.

Wade

BPG

No wasn't me Im afraid. I had my car checked over before it was bought and they say its fine. I havn't got a boost gauge as of yet but I guess thats quite important to check the boost. Ive got alot of money to spend on it but I would like to keep it below £1000 if possiable. I would really like to upgrade all the things that need doing like cooling first. It has 36,000 miles and is a 1995 twin turbo. Ive been told its a type R and is 280bhp standard.

BNA_ELLIS

well first there is no such thing as a 280 bhp rx7 before 99 specs. Alot of importers state this simply because they nothing really about rx7's. You will have either 265bhp as standard if it's a type r. When you open the drivers door on the sill a little below the door latch it will have a white sticker with tyre size and pressures then below that you should have another one with info on the car and will specify what it is whether type r, rb, rs etc. First thing I would say is buy a boost gauge if you have a £1000 to spend then all the mods you stated are not possible. for that amount I would say get back box alias catback and an induction kit, then save up to get an apexi powe fc tuning the apexi is quite cheap in uk.

rgds

Brian

BPG

What a cheeky ... I did say to him are you sure its 280 and he said yes. Oh well still shifts. Its got a back box and it pops. I think what I'll get is a boost gauge + a pod to put it in and leave it at that to be on the safe side. I'll remove the CAT when Ive got the money get a replacment ECU to get the fuel up a bit. I dont know what spiking is but I dont like the sound of it.

BNA_ELLIS

join fduk club and you will have alot of relavant info you need and the best places to get your car worked on, discounts when we do group buys etc. if you have £1000 and already have a catback then I would say a boost gauge and ecu. the difference in the apexi ecu is really good.

rgds

Brian

BPG

What and where is fduk? Its only a back box apparently. The guy said it wouldn't pass a test and get into the country if it was CAT back.

BNA_ELLIS

I don't know who the dealer is but thats aload of nonsense not to worry as long as it goes well and your happy thats what you pay them for.
type in www.fduk.org and sign up. not on the buyers list though thats only if you don't own a rx7 yet. It's one of the uk's 3rd gen rx7 club. We have a forum like this we share info etc have meets club events, and have some suppliers on the list so we get parts quite easily etc etc .

rgds

Brian

BPG

Thanx I'll do that.