How to reach the 11's
09-11-2009, 06:23 PM
#16
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Best 60ft time was 1.82 but I wasn't spinning. Top speed of 105. The car is shifting at 6500 RPM's. I totally agree with the dyno tune but don't want to do it until I buy all the right mods first. Got my LCA's today. Now looking for bigger injectors. How do find out the DA?
09-12-2009, 11:18 AM
#20
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A perfect launch is more than just not spinning. The stock suspension absorbs some of the energy that should be going into weight transfer as well as a whole lot more. If it was just wheel spin you could remedy that with larger/stickier tires.
09-12-2009, 11:35 AM
#21
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105mph at your altitude says there is a a problem somewhere. We can't tell you what it is.
The injectors is a problem but not as a big a one as people are making it out to be.
I think either there is a mechanical issue or the heads are not atall good.
Just because someone is a professional does not mean they are good and even if they are good with another application it does not mean they will be good with this one. They might be great but at this point something is very wrong and you just have to keep an open mind about what it might be.
The injectors is a problem but not as a big a one as people are making it out to be.
I think either there is a mechanical issue or the heads are not atall good.
Just because someone is a professional does not mean they are good and even if they are good with another application it does not mean they will be good with this one. They might be great but at this point something is very wrong and you just have to keep an open mind about what it might be.
09-12-2009, 11:43 AM
#22
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out of morbid curiosity...how much, on average, does it cost to get a good tune at a dyno shop? Just ballpark...I'm sure it varies widely. If it's not too crazy, I'd like to get mine on the dyno before I do any work to it at all (stock) so I know my baseline.
09-12-2009, 02:35 PM
#23
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The 105 trap speed is not good, that's why I asked. As 96capricemgr said it might be that the heads are not helping at all. Even still, people have run low 12s with just bolt ons and a cam. Once you replace the injectors you should get a dyno tune by someone that knows what their doing.
Once you know it's running right you can see if your 60ft and 1/4 mile times improve. I would think with your set-up you should be cutting at least low 1.7 60ft. times and trapping at least in the 110-112 mph range if the air is decent.
z0s0, a couple of pulls on the dyno with a wideband runs about $100, give or take a little. A full dyno tune can easily run $400-500. Next time though you should start a new post (thread?) to not step on someone elses and probably get more answers that way.
Once you know it's running right you can see if your 60ft and 1/4 mile times improve. I would think with your set-up you should be cutting at least low 1.7 60ft. times and trapping at least in the 110-112 mph range if the air is decent.
z0s0, a couple of pulls on the dyno with a wideband runs about $100, give or take a little. A full dyno tune can easily run $400-500. Next time though you should start a new post (thread?) to not step on someone elses and probably get more answers that way.
09-12-2009, 05:57 PM
#24
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Even though I don't feel any transmission slippage what are the chances it's slowing me down that much? Is there any way of telling if the heads are OK while on the car? I mean the car runs real good and feels like it pulls all the way through the RPM range. Would a dyno run reveal tranny or heads problem?
09-12-2009, 06:50 PM
#25
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1) The fuel injectors are an issue. At 100% duty cycle, you can make 400 horsepower. At full throttle the response from the engine will be unstable...and a 1/4 trip is a full throttle affair. I wouldn't bother with a dyno tune until you get the correct injectors.
2) You mentioned that the combustion chambers bowls were cleaned up. It doesn't take much to lower the compression ration. On the stock bore/head gasket setup, every cc the chamber is enlarged lower the compression ratio by 0.1 point. Do a compression test and let us know what you get for the psi reading...
2) You mentioned that the combustion chambers bowls were cleaned up. It doesn't take much to lower the compression ration. On the stock bore/head gasket setup, every cc the chamber is enlarged lower the compression ratio by 0.1 point. Do a compression test and let us know what you get for the psi reading...
10-13-2009, 06:55 AM
#26
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I've been doing some data-logging lately and found that not only are my injectors maxing out but I'm getting anywhere from 4-8* retard throughout the entire RPM range. How much would that effect my times?
10-13-2009, 03:27 PM
#29
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What mixed review have youy heard? You need bigger injectors to realize the potential of the engine. I don't think anyone disputes that at all.
10-13-2009, 03:32 PM
#30
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I'd rather not mention names because I don't want to hurt anyones' business. I agree that I need bigger injectors but I just wanted some more professional advice and make sure that there isn't another factor that could cause the injectors to max out.