ATS-V draggy times

MachME

MachME

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OneSlowV said:
Justin Schmidt and yes sir have wide band , down pipes , 45 percent fuel cam , LPFP and plugs going in should be a fun little ride .


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I would not replace the cam to compress the HPFP for 2 reasons
1. that is a lot of work
2. compressing the stock HPFP can damage it, it is not made for that. It can damage it physically but also if you demand too much pressure than it is made for, which is what you'll be trying to do with a tune.
3. Get a XDI HPFP, they make one for the ATS. The fuel pressure drop on DI cars is due to the rpm not spinning fast enough to hit the HPFP and also HPFP flow. The bigger HPFP will flow more fuel at lower rpm. Is the LPFP proven to be needed? Supplying the HPFP with more fuel is not going to help the HPFP or fuel pressure. If the high pressure desired vs actual is close to one another, the HPFP is being supplied enough fuel.
 
OneSlowV

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MachME said:
I would not replace the cam to compress the HPFP for 2 reasons
1. that is a lot of work
2. compressing the stock HPFP can damage it, it is not made for that. It can damage it physically but also if you demand too much pressure than it is made for, which is what you'll be trying to do with a tune.
3. Get a XDI HPFP, they make one for the ATS. The fuel pressure drop on DI cars is due to the rpm not spinning fast enough to hit the HPFP and also HPFP flow. The bigger HPFP will flow more fuel at lower rpm. Is the LPFP proven to be needed? Supplying the HPFP with more fuel is not going to help the HPFP or fuel pressure. If the high pressure desired vs actual is close to one another, the HPFP is being supplied enough fuel.
Click to expand...

No clue was told to get those parts to run e85 I haven’t heard it any issues with fuel cam on these cars at all so idk seem solid to me .


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justinschmidt1

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MachME said:
I would not replace the cam to compress the HPFP for 2 reasons
1. that is a lot of work
2. compressing the stock HPFP can damage it, it is not made for that. It can damage it physically but also if you demand too much pressure than it is made for, which is what you'll be trying to do with a tune.
3. Get a XDI HPFP, they make one for the ATS. The fuel pressure drop on DI cars is due to the rpm not spinning fast enough to hit the HPFP and also HPFP flow. The bigger HPFP will flow more fuel at lower rpm. Is the LPFP proven to be needed? Supplying the HPFP with more fuel is not going to help the HPFP or fuel pressure. If the high pressure desired vs actual is close to one another, the HPFP is being supplied enough fuel.
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1) its what needs to be done to run ethanol on the platform
2) the same goes for modifying any car, the stock parts arent made for more power than stock and you can damage them, pressure will not be more than stock. People run fuel cams all across the DI GM stuff these days, all of the LT engines run them, half the modded ATSVs have them and havent seen any HPFP failures, certainly not common.
3) the XDI pump is like 3,000 dollars AND still requires a fuel lobe cam to achieve what he wants to acheive. The LPFP is needed to run the ethanol content he wants to run, its not needed at E47.

I do agree, LPFP has no bearing on HPFP capabilities, they are 2 separate systems.
 
MachME

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I did a quick search. Cam shaft on atsv, stock HPFP nets roughly 20% more capacity.

XDI will net 35% on stock cam lobe and also flow more fuel, which helps at lower rpm, due to it's larger capacity.

So if a cam shaft/stock HPFP can run e85, then an XDI/stock cam shaft definitely could. XDI pump youll also be able to up pressure, which allows for better atomization.

If LPFP cannot pump e85, then that upgrade makes sense.

Just something to consider vs tearing into the motor.
 
MachME

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What is the going price for used atsv anyways?

Is there any aftermarket upgrade for the horrible stock gauge cluster?
 
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justinschmidt1

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MachME said:
I did a quick search. Cam shaft on atsv, stock HPFP nets roughly 20% more capacity.

XDI will net 35% on stock cam lobe and also flow more fuel, which helps at lower rpm, due to it's larger capacity.

So if a cam shaft/stock HPFP can run e85, then an XDI/stock cam shaft definitely could. XDI pump youll also be able to up pressure, which allows for better atomization.

If LPFP cannot pump e85, then that upgrade makes sense.

Just something to consider vs tearing into the motor.
Click to expand...

Theres more than 1 fuel lobe cam, there is one that you references at 21% roughly however ZZP has a more aggressive one that is rated at 45% which is what OP has.
 

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