[Camaro1973]

Originally Posted by JSH

Yes, it seems their experience is that if they're going to warranty it, the safest route is to add the 200 hp via cam/valve train/heads and 2# boost via the pulley. They believe SC heat is a killer.

I always assumed they would lock their tune because they have a lot of time invested in it, but what I didn't know or ask about before my purchase was that they would not disclose the details of any component to me. All I had to do was ask about this pre-purchase

They will not send me my tune and said that I will lose my warranty and have to start over with the stock tune if I want to add mods.

I don't hold any of this against them. They're protecting their packages.



Honestly, I'm 6-months into a 2-year warranty that's becoming less and less valuable to me. If I can find a reliable shop to tune it, I would do the ported blower and 103 TB or whatever adds ~50 hp, assuming the stock injectors and fuel pump will handle it

Honestly their build isn't anything special, and tbh "They believe SC heat is a killer." It is, but they slapped on overdrive pullies and didnt even port the SC or change the TB...


Their 850 package is rated at the crank, and I think a few people dynoed around 720rwhp with that package on dynojets. Whats yours? If same, youll gain a bit of power by porting the SC.


Honestly whats done is done, but you could of probably went somewhere else and got the same similiar package with the cam/heads and added a mag 2650 for what they charge.

[JSH]

I contacted other major shops and they were only slightly less costly with no warranty. One Houston shop was more expensive.

Porting the SC changing the TB are not part of their 850 pkg. I asked them about other mods but they don't deviate from their pkg. scopes of work.

So, your experience is that a ported SC and larger TB is worth 30-40hp? I think I've got enough injector and pump left to do that, which means I would need a new tune.

Originally Posted by Camaro1973

Honestly their build isn't anything special, and tbh "They believe SC heat is a killer." It is, but they slapped on overdrive pullies and didnt even port the SC or change the TB...


Their 850 package is rated at the crank, and I think a few people dynoed around 720rwhp with that package on dynojets. Whats yours? If same, youll gain a bit of power by porting the SC.


Honestly whats done is done, but you could of probably went somewhere else and got the same similiar package with the cam/heads and added a mag 2650 for what they charge.

[Camaro1973]

Originally Posted by JSH

I contacted other major shops and they were only slightly less costly with no warranty. One Houston shop was more expensive.

Porting the SC changing the TB are not part of their 850 pkg. I asked them about other mods but they don't deviate from their pkg. scopes of work.

So, your experience is that a ported SC and larger TB is worth 30-40hp? I think I've got enough injector and pump left to do that, which means I would need a new tune.

Well, what I mean is it really should be part of the package, or at least an option to let customers know. Your already paying many thousands for the package. It doesn't cost much to port the SC and add a new throttle body.


Without knowing your rwhp and your tune/log files who knows what you have left.


Usually when you get close to the 800rwhp mark is when a aux low side is needed.


You'll need a tune either way. Maybe wait a bit since you just had work done, still have the warranty and save up for a 2650 and forget about the stock sc heat pump.

[JSH]

Originally Posted by Camaro1973

You'll need a tune either way. Maybe wait a bit since you just had work done, still have the warranty and save up for a 2650 and forget about the stock sc heat pump.

You're right. The car runs really good now and is a lot of fun, which are the reasons I bought it. KingLT1 suggested sending my SC to a vendor like whipple for mods, which I probably the same work you suggested.

[Camaro1973]

Originally Posted by JSH

You're right. The car runs really good now and is a lot of fun, which are the reasons I bought it. KingLT1 suggested sending my SC to a vendor like whipple for mods, which I probably the same work you suggested.

You've already done cam/headwork which is good. I would just honestly leave it as is until you have the money to swap the blower. I wouldn't waste anymore labor time and money on the stock blower.


Whats it making to the wheel? I dont think i saw you mention that.

[JSH]

731/692

What other mods must be made with the 2650? injectors, low side FP, updated tune, etc.

I am just about to buy a Mighty Mouse that I assume would have to be relocate on a 2650.

Originally Posted by Camaro1973

You've already done cam/headwork which is good. I would just honestly leave it as is until you have the money to swap the blower. I wouldn't waste anymore labor time and money on the stock blower.


Whats it making to the wheel? I dont think i saw you mention that.

[KingLT1]

I would just wait till you can do a 2650 swap. I don't see the point putting any money into the stock supercharger. That stuff made sense back when PD supercharger options were limited. 2650 should also hook a little easier on the street if you keep it on the base 14psi pulley because it won't hit as hard. Another result of that is it will allow the fuel system to stretch out a bit further. That is a big issue with the LT4 unit. Once you pulley it down it becomes very twitchy with peak torque being around 2200rpm. Obviously guys run good track times with them but the street is a different ball game.

The fuel system upgrades will depend on what type of fuel you want to run. If you want to run some Ethanol then plan on FIC +30 injectors, LPE DI pump, and a Cordes low side if you are contingent on running DI only. A alternative solution is The ToohighPSI port injection system which is the most affordable but least proven. It's only been tested on a couple cars but the results were good. Crawford racing makes a legit PI system as well.

Basically that last 50whp you are looking for is going to add some substantial cost.

[IneedAZ]

Originally Posted by KingLT1

A alternative solution is The ToohighPSI port injection system which is the most affordable but least proven. It's only been tested on a couple cars but the results were good. Crawford racing makes a legit PI system as well.

I thought the TooHighPSI system raised the lid to the point the hood would have to be modified like the Edelbrock 2650. I do believe it works on the Vette without hood mod.

[JSH]

Gotcha. I would run pump gas like I'm doing now. Bandimere Raceway is only 3 miles away if I need higher octane.

Originally Posted by KingLT1

I would just wait till you can do a 2650 swap. I don't see the point putting any money into the stock supercharger. That stuff made sense back when PD supercharger options were limited. 2650 should also hook a little easier on the street if you keep it on the base 14psi pulley because it won't hit as hard. Another result of that is it will allow the fuel system to stretch out a bit further. That is a big issue with the LT4 unit. Once you pulley it down it becomes very twitchy with peak torque being around 2200rpm. Obviously guys run good track times with them but the street is a different ball game.

The fuel system upgrades will depend on what type of fuel you want to run. If you want to run some Ethanol then plan on FIC +30 injectors, LPE DI pump, and a Cordes low side if you are contingent on running DI only. A alternative solution is The ToohighPSI port injection system which is the most affordable but least proven. It's only been tested on a couple cars but the results were good. Crawford racing makes a legit PI system as well.

Basically that last 50whp you are looking for is going to add some substantial cost.

[KingLT1]

I would probably just do a 2650swap then have a second tune you can flash for race fuel when you go to the track. You should have enough fuel system for 850whp on MS109. I know you said your tune is locked but once your warranty is up you can request it to be unlocked if you are concerned about voiding it.

Originally Posted by IneedAZ

I thought the TooHighPSI system raised the lid to the point the hood would have to be modified like the Edelbrock 2650. I do believe it works on the Vette without hood mod.

I believe you are correct.

[IneedAZ]

Originally Posted by KingLT1

I would probably just do a 2650swap then have a second tune you can flash for race fuel when you go to the track. You should have enough fuel system for 850whp on MS109. I know you said your tune is locked but once your warranty is up you can request it to be unlocked if you are concerned about voiding it.



I believe you are correct.

Exactly what i did. Second tune for MS109

[JSH]

Originally Posted by KingLT1

I know you said your tune is locked but once your warranty is up you can request it to be unlocked if you are concerned about voiding it.
I believe you are correct.

I spoke with HPE about my tune last week and it's their position that it's proprietary and they will not unlock it for me, ever. This actually makes sense to me from their perspective.

I suppose HPE would be willing to edit this tune and leave it locked but with no warranty. All of which means another tuner will have to edited my stock tune if and when I make mods. I'm confident various tuners have LT4 tunes that are basically ready to go, so to speak.

[Camaro1973]

Originally Posted by JSH

I spoke with HPE about my tune last week and it's their position that it's proprietary and they will not unlock it for me, ever. This actually makes sense to me from their perspective.

I suppose HPE would be willing to edit this tune and leave it locked but with no warranty. All of which means another tuner will have to edited my stock tune if and when I make mods. I'm confident various tuners have LT4 tunes that are basically ready to go, so to speak.

As mentioned, nothing they do is special. So its up to you if you want to have someone tune the car again.


Take our advice, wait it out until you can/want to replace the blower. Then you can do it all then. You'll get close to 800rwhp but without a low side aux like the DSX, i doubt any tuner would want to take it much past 775 or so, unless its a really happy car. But anything past that you'll need a low side, then you'll need to start looking at bottom end work at that point once you get to 850. (this is of course on pump 93)

[JSH]

Originally Posted by Camaro1973

As mentioned, nothing they do is special.

Here we disagree because I believe they are the or one of the premier high performance car builders. What other shop does the volume they do and the range of vehicles they do?