When upgrading to a larger turbo is it necesary to go with a new set of chips?
05-08-2006, 09:36 PM
#1
Three Wheelin'
Thread Starter
When upgrading to a larger turbo is it necesary to go with a new set of chips?
Say for instance you have a set of chips from Tuner X that were mapped for the K26/6 or k26/8 turbo and then you had your turbo rebuilt into a K27. Would you need to get a new set of chips?
The reason I ask is I think that is what the PO of my car did.
IPSC
The reason I ask is I think that is what the PO of my car did.
IPSC
05-08-2006, 09:48 PM
#3
It woud be best to change the chips to some that are mapped for the turbo you are adding. I guess it's possible to use the old chips and use a fuel controller to add fuel but that the hard way to do it. Even though no map chip is perfect, think of them as directions on how to get to an address with the address being a good AFR. The old K26 chips will get you within half a mile but then you'd have to test and retest to find the rest of the way there. The K27 chips can get you within a block and you can see what you need to do from there.
05-08-2006, 09:52 PM
#4
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If you are running a MAF then no. You shouldn't have to change any of the engines parameters if the chips were tuned across the map. Then again the 951's ECU is so archaic that it might not be the same as later model ECU's.
05-08-2006, 09:58 PM
#5
Originally Posted by Driftomagnifico
If you are running a MAF then no. You shouldn't have to change any of the engines parameters if the chips were tuned across the map. Then again the 951's ECU is so archaic that it might not be the same as later model ECU's.
The fuel map is completely different for different turbos. You can't have a good fuel map for a K26/8 and expect it to be good for a K27. The MAF has nothing to do with fuel control.
05-08-2006, 10:10 PM
#6
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Originally Posted by streckfu's951
Wrong.
The fuel map is completely different for different turbos. You can't have a good fuel map for a K26/8 and expect it to be good for a K27. The MAF has nothing to do with fuel control.
The fuel map is completely different for different turbos. You can't have a good fuel map for a K26/8 and expect it to be good for a K27. The MAF has nothing to do with fuel control.
The MAF has EVERYTHING to do with fuel control.
As I said before, the only problem is when the engine exceeds the MAP's control or tuned area, but I highly doubt the tuners are leaving out parts of the MAP.
You might trim fuel and ignition timing to optimize the setup (cooler boost temps), but the actual airflow to the engine at 1 BAR is the same with any turbo.
05-08-2006, 10:21 PM
#7
Originally Posted by Driftomagnifico
but the actual airflow to the engine at 1 BAR is the same with any turbo.
Absolutely NOT!
That statement is very common for those new to turbos.The volume of airflow is going to be very different between turbos. A K27 will flow more air at 1 bar than a K26 and a VR sII or Lindsey Super 61 will flow more than the the K27.
Not to mention, the size/profile of the turbine greatly impacts where in the rpm range a given flow is achieved.
As for the MAF, it does not control fuel. The input FROM the MAF is used to determine fuel but hte MAF does not perform this function.
Last edited by streckfu's951; 05-08-2006 at 10:37 PM.
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05-08-2006, 10:30 PM
#8
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951 is right it depends if you have a AFM or a MAF and what size turbo. It depends on the size of the turbo different sizes sucks different about of air...
05-08-2006, 10:44 PM
#9
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Originally Posted by streckfu's951
Absolutely NOT!
No where do you make an adjustment for the physical size of the compressor. The only variation you make is adjusting the engine VE due to the reduction in exhaust side backpressure with a larger exhaust side.
The only additional airflow that can be derived from a larger compressor is that the air is at a greater condensated state due to compressor efficiency. After the intercooler the effect is minimal.
05-08-2006, 10:48 PM
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Originally Posted by reno808
951 is right it depends if you have a AFM or a MAF and what size turbo. It depends on the size of the turbo different sizes sucks different about of air...
MAF = Mass Air Flow Meter
You are thinking about the difference between speed-density and mass flow. Neither would require a retune with a turbocharger as the only overall VE change is on the exhaust side.
to your headgasket.