What turbo for 500-550bhp?
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08-01-2009, 01:17 PM
#163
Shall i start a poll called lets guess AVA's top-secret military protected turbo secret and see if anyone can get it. Or better still, I will just call Mark Shead and he will tell me what it is and then i may be able to sleep better tonight.
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08-01-2009, 02:01 PM
#169
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08-01-2009, 06:48 PM
#176
PassionFord Post Whore!!
I would just like to add that the problem with Euan's engine was the exact same as the MAD engine, in that they used long studs not really up to the job. Both companies switched to the same ones and the problem was resolved.
The issue was the longstuds stretching causing head gasket failure, I fail to see how this is an engine failure, as the engines were still running perfectly, but were pressurising the cooling system.
When you run engines at this power level, things break, so you have to have the BEST parts available. You only learn at what power level things break / are inadequate by pushing these limits.
Also, regarding my own engine making 395bhp at the wheels at AVA compared to Euans, you cannot compare apples with oranges. My car had a hugely tall final drive (3.36), which meant that my 4th gear was equivalent to most Cossies 5ths and it would have hit over 160mph on the rollers @ 8000rpm. Combine that with high ambients and the fact that the intercooler was insuffcient to maintain charge temps at below 55°C (inducing ignition retard), and the fact that the WI was flat out trying to maintain temps, would all have contributed to lower figures.
Just so you can see the difference - at 1.2 bar, it made 320bhp @ the wheels (perfect ACTs), at 2.2 bar, this only climbed by 75bhp with poor ACTs etc. With a more efficient intercooler (Euan had TWO RS500 ones welded together) and standard gearing, I would imagine that it would have seen at least 420bhp - 430bhp @ wheels...
Incidentally, my roller bearing T4 makes full boost by 3500rpm. People forget that cam choice / timing is critical in turbo boost threshold, and so a turbo is often critcised for it's poor threshold, when it is actually running cams / timing mismatched to the turbo.
The issue was the longstuds stretching causing head gasket failure, I fail to see how this is an engine failure, as the engines were still running perfectly, but were pressurising the cooling system.
When you run engines at this power level, things break, so you have to have the BEST parts available. You only learn at what power level things break / are inadequate by pushing these limits.
Also, regarding my own engine making 395bhp at the wheels at AVA compared to Euans, you cannot compare apples with oranges. My car had a hugely tall final drive (3.36), which meant that my 4th gear was equivalent to most Cossies 5ths and it would have hit over 160mph on the rollers @ 8000rpm. Combine that with high ambients and the fact that the intercooler was insuffcient to maintain charge temps at below 55°C (inducing ignition retard), and the fact that the WI was flat out trying to maintain temps, would all have contributed to lower figures.
Just so you can see the difference - at 1.2 bar, it made 320bhp @ the wheels (perfect ACTs), at 2.2 bar, this only climbed by 75bhp with poor ACTs etc. With a more efficient intercooler (Euan had TWO RS500 ones welded together) and standard gearing, I would imagine that it would have seen at least 420bhp - 430bhp @ wheels...
Incidentally, my roller bearing T4 makes full boost by 3500rpm. People forget that cam choice / timing is critical in turbo boost threshold, and so a turbo is often critcised for it's poor threshold, when it is actually running cams / timing mismatched to the turbo.
Mike you are total incorrect on what you have said, You need to ask AVA what eauns problems were as they were not the same as the faults I have had with Rods, And no the head bolts were not the problem on Rods.
Mark
07-02-2010, 10:26 PM
#189
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Hi to all.
I intend to use a gt35 turbo. My question is what sort of cams I will use.
Can someone help? I had in mind a BD15 exhaust and BD16 inlet but not sure!!
For 1/4 mile use.
Cheers
I intend to use a gt35 turbo. My question is what sort of cams I will use.
Can someone help? I had in mind a BD15 exhaust and BD16 inlet but not sure!!
For 1/4 mile use.
Cheers
07-02-2010, 10:46 PM
#191
Too many posts.. I need a life!!
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