New celica gt4 owner. advice needed
Discussion
Hi guys in new to my celica and turbo cars in general. I just bought a celica gt4 st205 wtf with a few mods. It has cat back exhaust and induction kit. It also had a turbo timer with boost gauge. It's a blitz but not sure what model. I just had a few questions I was wondering if anyone could clear up.
The boost gauge is digital and connects up to what was a plugged port on the back of the inlet manifold. I was wondering if this was an ok place to put it?
Also the boost gauge saves your peak level and this seems too high to me, it records it as 1.15 bar. I do not have the boost turned up. It seems to hit this level when I floor it at high revs then drop back down to 0.95 where it should be. But the boost gauge is a bit crap so not sure if its spiking or creeping. I that kind of overshoot normal? If not what could be causing it?
Most of the time the car holds 0.95 it's only at high revs.
Thanks in advance people
The boost gauge is digital and connects up to what was a plugged port on the back of the inlet manifold. I was wondering if this was an ok place to put it?
Also the boost gauge saves your peak level and this seems too high to me, it records it as 1.15 bar. I do not have the boost turned up. It seems to hit this level when I floor it at high revs then drop back down to 0.95 where it should be. But the boost gauge is a bit crap so not sure if its spiking or creeping. I that kind of overshoot normal? If not what could be causing it?
Most of the time the car holds 0.95 it's only at high revs.
Thanks in advance people
Check to make sure it's not had a manual boost controller fitted, if it has you want to get rid of that asap as they're only bad news. I'd recommend getting a mapper to look at it if you're not sure, if the mapping is likely to be expensive maybe research what turbo/injector upgrades are popular before you get it mapped so you get some more bang for your buck!
Congrats on the car anyway always had a soft spot for the GT4s
Congrats on the car anyway always had a soft spot for the GT4s
Mate of mine is restoring/rebuilding his. - Thread ---> http://retrorides.proboards.com/thread/123485/96-t...
He may have a HKS boost controller for sale soon... :-)
He may have a HKS boost controller for sale soon... :-)
Had a quick word with a mate of mine who knows these cars very well, he suggests it's a pretty common problem with excessively big-bore exhausts and a standard turbo. How big a 'zorst is it? 3"?
He also says 1.15 is right on the limit for the standard turbo but the engine is good for it so as long as it's in good condition it shouldn't do any damage.
The gt4oc forum is probably your best bet - tons of knowledgeable people there including the bloke I've been talking to.
He also says 1.15 is right on the limit for the standard turbo but the engine is good for it so as long as it's in good condition it shouldn't do any damage.
The gt4oc forum is probably your best bet - tons of knowledgeable people there including the bloke I've been talking to.
Thanks a lot for all of the help guys I appreciate it a lot. So do you think it could just be the exhaust? Is ther any way to rectify this as I want to fit an electronic boost controller but not while it is fluctuating like this as I could hit fuel cut. I think I still have the cat in my exhaust but I will have to check this out when I get home. I presume this would only happen with the cat out or is a catback and intake enough to cause this?I also really want a proper boost gauge as my digital one is far too hard to read as the numbers jump about all over the place. Anyone recommend a decent affordable one?. I presume this would.
Thanks again for the help
Thanks again for the help
The boost spike to 1.15 is all good on this engine, and turbo.
Its the same engine as the Mr2 turbo, this does not need mapped to run this... boost cut is at 1.20 bar. So all is good.
These engines, are designed to give extra boost if the conditions are right.... If its got a decat on it and big exhuast it will probably be in the initial spike then settling.
I personally would not worry.
I had one and it ran at 1.2 bar without any problems like most other guys using this engine that do some changes to it.......... if you are really that worried, can an electronic boost controller, set it to 1 bar, and turn the gain down on it, this should stop the initial spike.
But i would leave it, because all is well.
Its the same engine as the Mr2 turbo, this does not need mapped to run this... boost cut is at 1.20 bar. So all is good.
These engines, are designed to give extra boost if the conditions are right.... If its got a decat on it and big exhuast it will probably be in the initial spike then settling.
I personally would not worry.
I had one and it ran at 1.2 bar without any problems like most other guys using this engine that do some changes to it.......... if you are really that worried, can an electronic boost controller, set it to 1 bar, and turn the gain down on it, this should stop the initial spike.
But i would leave it, because all is well.
Hi guys I had a quick look today and my car still has the cat in so is this still normal or is there something else going on? Is there any checks you recommend I should take? Or do I just need an ebc to stop this. If I get an ebc and set it to say 1.15 bar will it not still overshoot?
Thanks for all the help so far
Thanks for all the help so far
SPend an afternoon in the company of Martin Kingston from MK Auto Repairs & Tuning in Blackburn. You'll lean more about your car in that time than all the rest of your life put together. And if Martin says it's a good one then it is. If he says it's broken, then it's because it is. Martin is the GT4 God.
Do yourself that favour.
They are great cars, once you understand em.
Do yourself that favour.
They are great cars, once you understand em.
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