gt 35 compressor stall
24-07-2004, 07:44 PM
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gt 35 compressor stall
a mate of mine had his cossie on the rollers today at engine advantages and made 550bhp@ 28 psi of boost 
trouble is he was aiming a bit higher but when the boost was uped all you'd get is alot of compresor stall. what would cause this? his spec is gt35, rs500 inlet, 8 greens, 7:2.1 comp, grp a ported head, bd16 inlet and bd14 exhaust cam. the only thing we can think of is the exhaust cam is to small because the air is getting in but can't consume it into the exhaust quick enough causing the turbo to stall? any input would be apprieciated thanks.
trouble is he was aiming a bit higher but when the boost was uped all you'd get is alot of compresor stall. what would cause this? his spec is gt35, rs500 inlet, 8 greens, 7:2.1 comp, grp a ported head, bd16 inlet and bd14 exhaust cam. the only thing we can think of is the exhaust cam is to small because the air is getting in but can't consume it into the exhaust quick enough causing the turbo to stall? any input would be apprieciated thanks.
24-07-2004, 07:50 PM
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needing bigger inlet valves? only thing i can think of is the engine cant take in all the air as the valves are too small or cam lift and duration isnt good enough...but im probably wrong
24-07-2004, 08:17 PM
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i would not be asking if paul had said anything 
seems like when you get into this sort of power range tuners seem reluctant to give advice unfortunatly 
but as far as i know paul did not seem to know, cheers
seems like when you get into this sort of power range tuners seem reluctant to give advice unfortunatly but as far as i know paul did not seem to know, cheers
24-07-2004, 08:22 PM
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Question for the un-initited.
What is Compressor stall? Is it that the shaft actually stops or just the power line on the graph just plateauxs at a certain point?
What is Compressor stall? Is it that the shaft actually stops or just the power line on the graph just plateauxs at a certain point?
24-07-2004, 08:25 PM
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I don't know enough about that level of spec to give any decent advice, but reckon you and the above posting (weegaz) are on the right track, or at least sounds plausible.
Time to speak to some other tuners methinks..... Martin Hadland of Reyland Motorsport (figures/performance stat's speak for theselves, and his prices might surpirse you!) & Harvey@SCS have plenty of experience with this level of tune, or there's Stu@Motorsport Developments, Karl Norris who both use this board.
Incidentally, who spec'd/ mapped / built the engine / decided on turbo?
Good luck getting it sorted.
Time to speak to some other tuners methinks..... Martin Hadland of Reyland Motorsport (figures/performance stat's speak for theselves, and his prices might surpirse you!) & Harvey@SCS have plenty of experience with this level of tune, or there's Stu@Motorsport Developments, Karl Norris who both use this board.
Incidentally, who spec'd/ mapped / built the engine / decided on turbo?
Good luck getting it sorted.
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25-07-2004, 11:51 AM
#13
DEYTUKURJERBS
Originally Posted by Spiky
Originally Posted by Itsmeagain
GT35 and Engine Advantages...
I predict a rod will shortly come flying clean out the block...
I predict a rod will shortly come flying clean out the block...
again you mean
has cossie400s mates car already thrown a rod?
25-07-2004, 12:03 PM
#15
DEYTUKURJERBS
now your talking in riddles
i know of 2 EA cars that both recently pushed nearly 600bhp with GT35s and then not long after decided to put a rod into orbit.
someone REALLY needs to teach EA whats a "good" external wastegate mounting position, and whats a "easy, but wont fookin work" one too 
ive lost all faith in em!
i know of 2 EA cars that both recently pushed nearly 600bhp with GT35s and then not long after decided to put a rod into orbit.
someone REALLY needs to teach EA whats a "good" external wastegate mounting position, and whats a "easy, but wont fookin work" one too
ive lost all faith in em!
since brendon has left you just dont seem to get the same level of help its get in get out
25-07-2004, 12:33 PM
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Unless its just miss-firing then the problem will be that it can't consume enough air! I'd be doublechecking the head porting to see if it is all it's made out to be!
25-07-2004, 12:37 PM
#19
DEYTUKURJERBS
Originally Posted by Jon ERST S2
The other guy has left?
How come?
How come?
25-07-2004, 12:43 PM
#21
DEYTUKURJERBS
if the wastegate was fitted in such a stupid place it could hardly flow anything, so the boost was going sky high, then thats a problem.
dont think thats why threw a rod tho, jus one of the problems
dont think thats why threw a rod tho, jus one of the problems
25-07-2004, 12:52 PM
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Time to speak to Martin or karl if you ask me.... two people who have fitted GT turbos on YB engines and had proven and reliable results.
Look at what Steve says... Coincidence??? NOT in my opinion.
Look at what Steve says... Coincidence??? NOT in my opinion.
25-07-2004, 02:34 PM
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25-07-2004, 03:45 PM
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Re: gt 35 compressor stall
Originally Posted by cossie400
a mate of mine had his cossie on the rollers today at engine advantages and made 550bhp@ 28 psi of boost trouble is he was aiming a bit higher but when the boost was uped all you'd get is alot of compresor stall. what would cause this? his spec is gt35, rs500 inlet, 8 greens, 7:2.1 comp, grp a ported head, bd16 inlet and bd14 exhaust cam. the only thing we can think of is the exhaust cam is to small because the air is getting in but can't consume it into the exhaust quick enough causing the turbo to stall? any input would be apprieciated thanks.
trouble is he was aiming a bit higher but when the boost was uped all you'd get is alot of compresor stall. what would cause this? his spec is gt35, rs500 inlet, 8 greens, 7:2.1 comp, grp a ported head, bd16 inlet and bd14 exhaust cam. the only thing we can think of is the exhaust cam is to small because the air is getting in but can't consume it into the exhaust quick enough causing the turbo to stall? any input would be apprieciated thanks.the problem is in the design if you ask me, we have tried 5 engines with rollerbearing turbo's for rally purposes (2 cosworth and 3 evo 7 engines)
they all went bang because of the rollerbearings being eaten by the engine, after some research it showed that the axle was giving way when you go off throttle (up and above 2 bar or 28 psi or more)
this seems to wreck the rollerbearing and since going off throttle happens a lot on a rally car
the engines never made it to the finish line.. and we quit using them in the rally because we like to make it to the finish line
garett only gives support up to 2.6 bar (1.6 bar absolute)..
which is to low for the rally..
nowadays it seems you can get hybrid ones which should do better but i am not trying anymore
25-07-2004, 04:00 PM
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Originally Posted by GARETH T
garett only gives support up to 2.6 bar (1.6 bar absolute)..
yes... thats what i meant..
25-07-2004, 04:33 PM
#31
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Re: gt 35 compressor stall
Originally Posted by cossie400
a mate of mine had his cossie on the rollers today at engine advantages and made 550bhp@ 28 psi of boost trouble is he was aiming a bit higher but when the boost was uped all you'd get is alot of compresor stall. what would cause this? his spec is gt35, rs500 inlet, 8 greens, 7:2.1 comp, grp a ported head, bd16 inlet and bd14 exhaust cam. the only thing we can think of is the exhaust cam is to small because the air is getting in but can't consume it into the exhaust quick enough causing the turbo to stall? any input would be apprieciated thanks.
trouble is he was aiming a bit higher but when the boost was uped all you'd get is alot of compresor stall. what would cause this? his spec is gt35, rs500 inlet, 8 greens, 7:2.1 comp, grp a ported head, bd16 inlet and bd14 exhaust cam. the only thing we can think of is the exhaust cam is to small because the air is getting in but can't consume it into the exhaust quick enough causing the turbo to stall? any input would be apprieciated thanks.
25-07-2004, 09:01 PM
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turbo stall eh thats what happens with an incorrectly specced engines those turbos are good seen 2 on dyno recently produce 600 bhp neither had any stalling problems but engine specs were a lot more up to date and were running on better ecus
25-07-2004, 09:22 PM
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they all went bang because of the rollerbearings being eaten by the engine, after some research it showed that the axle was giving way when you go off throttle (up and above 2 bar or 28 psi or more)
Turbinator, Were you running a Dumpvalve on these cars?
Karls, Martins, and my Turbo that did the Gumball have had NO problems at all in the cars....all running over 600bhp reliably. Not heard of any problems with these Turbos at all apart from what YOU have alledged happened. They DO need to be watercooled and run dumpvalves though.
Be interesting as more and more people use these Turbos and I think you will be proved to be very wrong!
25-07-2004, 10:19 PM
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Originally Posted by Kev.H
I read a few strange stories about EA now 
what big power cars have let go ?? is the white wrc wing'd Ractek car still going ????
what big power cars have let go ?? is the white wrc wing'd Ractek car still going ????i mentioned this in another post but since we are on the subject again i'll say it again. EA are the worst rip-off tuners i have ever seen
25-07-2004, 10:43 PM
#37
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i heard ian from racetek was a bit shocked after his engine let go then the respnse from EA
after spending thousands of pounds with the company
2nd hand wives gossip tho
thats what these forums are all about.
cossie 400
is the car in question daves car ?
after spending thousands of pounds with the company
2nd hand wives gossip tho
thats what these forums are all about.
cossie 400
is the car in question daves car ?
25-07-2004, 10:46 PM
#39
Originally Posted by weegaz22
needing bigger inlet valves? only thing i can think of is the engine cant take in all the air as the valves are too small or cam lift and duration isnt good enough...but im probably wrong
25-07-2004, 10:55 PM
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CraigN,
i heard ian from racetek was a bit shocked after his engine let go then the respnse from EA
after spending thousands of pounds with the company
2nd hand wives gossip tho
i heard ian from racetek was a bit shocked after his engine let go then the respnse from EA
after spending thousands of pounds with the company
2nd hand wives gossip tho