[PRAY]

Since there are some very knowledgeable folks in this forum I figured I would pose the question here.

From what I am seeing on CF and other sites it appears that 750rw max effort is about it for the LT4. I understand what it takes to get there, H/C/E/Fuel etc. I am just looking for what you guys have seen as the limit of this blower regardless of what is below it or in front of it.

When looking inside this blower compared to the LSA series GM did a really good job of opening everything up. I can see some gains with porting but not like the old days. I am assuming a 2.38" upper and 10-14% lower is about all you are going to get with how small this thing is and how tightly it is wound from the factory without over driving it and actually losing power.

I don't have giant power goals. I think a legit 700/750rwhp/tq will get me to my goals pretty easily with the car set up properly.

[DFW1LE]

I thought you were working off an LT1, did you add something new under the hood? Good question nevertheless.

[PRAY]

I have had this LT4 blower on the shelf for about 6 months I guess. It is a complete brand new kit for a CTS-V so it is a direct bolt on with the ADM adapter plates. I have the Magnusson heat exchanger kit and ZL1 elbow for it as well. I just need to get two harnesses and a T-MAP sensor and it will be ready to bolt on. I go back and forth on selling it or even going F/I at all. Some of the centri offerings are getting pretty interesting.

I am working over a set of heads and have been talking to Ted@JRE about some custom cam specs when I am complete with the heads. I have one very simple goal, run 9's@140 in my daily. 9's is actually going to be a bit easier than I originally though due to this awesome A8 and the traction provided in stock form with the right tire combo. But the 140 in this car is going to be a bit of a tall order. For my own personal pleasure I prefer a car that hits hard with small throttle applications. I understand that in the end a Centri will be faster and have greater potential.

I bought this car solely as a test bed and a platform to develop products on and perfect my LT1 tuning capabilities with. I have to stay focused on bang for the buck mods and product development that has ROE. A blower doesn't help that cause. With everything it is going to take fuel wise and everywhere else I am almost considering just staying N/A on E and see how deep into the 10's I can get and possibly be happy with it.

That brings me back full circle to the capabilities of the blower I have already invested in and have sitting on the shelf. If it will do what I need it to do without investing any more money and time into it then it will eventually find it's way onto the car. Eventually.

[DFW1LE]

Thanks for that explanation, we are all pulling for you. I don't want to pull this away from your original question, but given your goal, I really wonder how much can be gained in terms of lowering times by spending additional time on the suspension/tire combo while increasing engine power. Most of the focus on the forum is about the engine side, but not so much on the suspension/tire side. What are your thoughts on this Pray?

[PRAY]

For me for now suspension is wasted money. I am dead hooking at 28psi in my current wheel/tire combo. With a stall I still don't see an issue on the horizon. With an extra 200rwtq, I am expecting there will be a problem.

[Atomic Ed]

I'm with you on your line of thinking. I too believe in mild porting adds value and plan to do my snout and manifold adapters some time in the future. I'm very much a neophyte when it comes to porting, but I've had good luck with just keeping it simple, paying attention to abrupt changes in flow directions, and watching material thickness. I would like to get a flow bench some day, but it's pretty low on my buy list.

Some thoughts: The TVS 2300s are showing 750 rwhp over in the Corvette forums without too big of an issue. 620-650 rwhp is a high end goal for me some time in the future. The E-Force should be a nice fit to my goal.

To me, the biggest issue is the intake path restriction on the PD with the snout and the TB being the main restriction. Porting has got to help this. Your TVS 1700 may be a little more challenging to get up to 750 rwhp.

A though would be if someone could port out our stock TBs to, say, 95mm and match the snout to that diameter. Could be helpful for those pushing above 700 rwhp.

[PRAY]

I have a couple different stages of TB porting. One if which is doing the back ot the TB to port match either my max effort stock manifolds or the MSD. I can't do anything about blade diameter but I work over everything else pretty hard to include the TB blade bar.

[Atomic Ed]

If one were to open up the TB bore, a new blade would definitely be required. But once you start manufacturing a new blade along the porting work, it may not be worth the effort.

Good luck with this. I will certainly be following this build.

[PRAY]

It would have to be done in a CNC machine IMHO. Getting something that big, that perfectly round by hand would be pretty darn difficult. I wouldn't even try tackling something like that. I don't even know if there is enough material in there for something like that.

[SGDM]

Originally Posted by PRAY

It would have to be done in a CNC machine IMHO. Getting something that big, that perfectly round by hand would be pretty darn difficult. I wouldn't even try tackling something like that. I don't even know if there is enough material in there for something like that.

Dremel and some sand paper, good to go. Good luck and anxious to see what you decide to do. You can get to 750 but will need to fuel the thing, I am right at the ragged edge with stock fuel system. My low side pressure is 2.1 but HP side is 47 psi and needs to be 55 psi. I may drop a new ZL1 pump in and see if it will provide the higher pressure. Very happy with my LT4 blower and performance.

[PRAY]

Oh yeah, I am tracking everything needed to make the numbers. I am just curious to see what the blower itself will do. It appears that Vengeance just made 760 on a ZL1 on E. How they got the fuel system to do that I don't know. I am assuming they are throwing a ton of meth at it on pump and even more on E to make the numbers. They didn't even port the blower or heads. It did look like the ZL1 has a way better lid than the Z and the V. I wonder if I can trade in my V lid for a ZL lid. I will have to hit up the dealership about that one.

[laynlo15]

Mike (toohighpsi) is working on his setup right now with new injectors and big pump and he expects to see 700 plus, hopefully he'll post some numbers pretty soon. He was working on the injector install today and expected to do some pulls tonight and then to the track next week.

[Atomic Ed]

Originally Posted by PRAY

It would have to be done in a CNC machine IMHO. Getting something that big, that perfectly round by hand would be pretty darn difficult. I wouldn't even try tackling something like that. I don't even know if there is enough material in there for something like that.

Water jet table might do the trick for the disk.

[EDFHOBBIES]

Originally Posted by PRAY

Since there are some very knowledgeable folks in this forum I figured I would pose the question here.

From what I am seeing on CF and other sites it appears that 750rw max effort is about it for the LT4. I understand what it takes to get there, H/C/E/Fuel etc. I am just looking for what you guys have seen as the limit of this blower regardless of what is below it or in front of it.

When looking inside this blower compared to the LSA series GM did a really good job of opening everything up. I can see some gains with porting but not like the old days. I am assuming a 2.38" upper and 10-14% lower is about all you are going to get with how small this thing is and how tightly it is wound from the factory without over driving it and actually losing power.

I don't have giant power goals. I think a legit 700/750rwhp/tq will get me to my goals pretty easily with the car set up properly.

So I met the owner of the SEMA Z06 Edelbrock eforce R & D car this weekend at Memorial city coffee n car Houston.. they had it for 7 mos. and it was along side being worked on with the calloway z06.. the way it sounded it was the same blower w a different lid..

Just putting on the Eforce he picked up 100 plus RWHP over the 1.7 blower no other mods.

Of course that wasn't enough He has done headers, CAI, Cam and E85.. It was not a typical big blower cam just did a swap for the lobe he had little if any chop he did all of this after SEMA..

He is a 847 RWHP and 922 Torque that with stock pulleys..

you never get that in a million years from a 1.7 with out the aid of butt load of meth and over spinning the blower..