More power - Decisions
09-24-2018, 06:13 PM
#1
Racer
Thread Starter
More power - Decisions
Hi,
Trying to source info how to get more power from our 968.
Handling is great keeping up with modern GT3s in the corners but tired of lacking umph on the straits and out of corners. This chassi deserves more..
So couple of options:
1: Buy an already built engine dynoed 237 whp on a good dyno nearby. Should be conservative so maybe a bit more to give.
Engine is built over many years and has:
Balanced crank
- Pauter rods, crank scraper, baffled dump, Oil pickup mod, BS axle delete, BMW M 535 throttle, Worked head, RS Barn cams, Bigger injectors, Tuned motronic, Light weight alternator, New clutch, fidanza flywheel, RS Barn headers, Fresh bearings etc, RS barn exhaust.
The engine costs 10500$ and not sure if this is enough and have already much money in it.
2: Build up the existing stock engine and put 7500$ in mods. What kind of levels are we getting to with which mods? RS barn stage 2 Headers and exhaust I can buy for 1500$, Cams 2500$, ITB 2200$, VEMS Ecu 1400$.
What will above give?
3: Build a 3 liter turbo engine. Have a scored scored complete 951 engine/harness and a good 3 liter block, 968 crank, 2,7 head, GT30 turbo.
The car will also be a Turbo RS look next season.
Need rods, pistons and block needs honing and the engine a complete build of course.
Looking for inputs...
Thanks
/P
Trying to source info how to get more power from our 968.
Handling is great keeping up with modern GT3s in the corners but tired of lacking umph on the straits and out of corners. This chassi deserves more..
So couple of options:
1: Buy an already built engine dynoed 237 whp on a good dyno nearby. Should be conservative so maybe a bit more to give.
Engine is built over many years and has:
Balanced crank
- Pauter rods, crank scraper, baffled dump, Oil pickup mod, BS axle delete, BMW M 535 throttle, Worked head, RS Barn cams, Bigger injectors, Tuned motronic, Light weight alternator, New clutch, fidanza flywheel, RS Barn headers, Fresh bearings etc, RS barn exhaust.
The engine costs 10500$ and not sure if this is enough and have already much money in it.
2: Build up the existing stock engine and put 7500$ in mods. What kind of levels are we getting to with which mods? RS barn stage 2 Headers and exhaust I can buy for 1500$, Cams 2500$, ITB 2200$, VEMS Ecu 1400$.
What will above give?
3: Build a 3 liter turbo engine. Have a scored scored complete 951 engine/harness and a good 3 liter block, 968 crank, 2,7 head, GT30 turbo.
The car will also be a Turbo RS look next season.
Need rods, pistons and block needs honing and the engine a complete build of course.
Looking for inputs...
Thanks
/P
09-26-2018, 12:40 AM
#4
Option 3!
No brainer for easy 350whp.
No brainer for easy 350whp.
09-26-2018, 12:41 PM
#5
Racer
Thread Starter
Ok, one vote for turbo Engine it is :-)
So anyone have Picture of whats need to be cut to fit an 951 IC? I want it at the original spot so it looks and functions like the RS IC and ducting.
No info on the other options?
/P
So anyone have Picture of whats need to be cut to fit an 951 IC? I want it at the original spot so it looks and functions like the RS IC and ducting.
No info on the other options?
/P
09-26-2018, 01:46 PM
#7
Race Car
I have a brand new set of Molykote Wossner pistons with pins and rings for 16V 2.5 block at 100.5mm and 9:1CR if you were doing a 16V 2.5 w/turbo...
Cheap.
T
Cheap.
T
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09-26-2018, 03:20 PM
#8
Rennlist Member
Other option: Buy a 996. They are one of the best values going and have a lot more power and handle just as good or better. Putting $10K into your engine is going to create a small HP gain/$. Putting a turbo motor in is going to cost a fortune.
My NA 996 is 300 HP, sometimes I wish I had more.....but it's fast, especially mid and upper range. They are stupid cheap for what they are.
You asked for more options, there is one.
Or if you want more power, a super nice 951 that is already done is another way to go. I have 285 ft-lbs of torque at the rear wheels on mine and it HAULS on the highway......so much fun in the power department. Until the boost kicks in, it's not that quick....but that's only first gear if you play your cards right.
My NA 996 is 300 HP, sometimes I wish I had more.....but it's fast, especially mid and upper range. They are stupid cheap for what they are.
You asked for more options, there is one.
Or if you want more power, a super nice 951 that is already done is another way to go. I have 285 ft-lbs of torque at the rear wheels on mine and it HAULS on the highway......so much fun in the power department. Until the boost kicks in, it's not that quick....but that's only first gear if you play your cards right.
09-27-2018, 04:20 AM
#9
Racer
Thread Starter
Option 4: Supercharger...Well yes that’s certainly an option to think about.
Their kit doesn’t say anything about machining the pistons but why would this be desirable to do, lower compression?
Maybe their stage 1 connected with bigger injectors and a VEMS ecu.
I also guess that headers and exhaust would be good and give some extra hp as well?
Sorry no 2,5 16v build for this one!
A 996 is a nice car but had 2 already and the only models I would get is gt3 or turbo. The normal models are of no match for the 968 at track and modified turbos run equal times with our 968 at a much higher cost.
We also have a 951 and a 964 and the 968 is a keeper so we want to develop it to a better performer and kill some newer gt-cars!
Their kit doesn’t say anything about machining the pistons but why would this be desirable to do, lower compression?
Maybe their stage 1 connected with bigger injectors and a VEMS ecu.
I also guess that headers and exhaust would be good and give some extra hp as well?
Sorry no 2,5 16v build for this one!
A 996 is a nice car but had 2 already and the only models I would get is gt3 or turbo. The normal models are of no match for the 968 at track and modified turbos run equal times with our 968 at a much higher cost.
We also have a 951 and a 964 and the 968 is a keeper so we want to develop it to a better performer and kill some newer gt-cars!
09-27-2018, 07:13 AM
#10
Racer
Thread Starter
Here she is. Will do the RS naca ducts and the IC outlet.
still interested though how the S/RS got the air to the IC? Its metall where the airflow should go and completely blocket off.
09-27-2018, 11:20 AM
#11
Race Car
Option 4: Supercharger...Well yes that’s certainly an option to think about.
Their kit doesn’t say anything about machining the pistons but why would this be desirable to do, lower compression?
Maybe their stage 1 connected with bigger injectors and a VEMS ecu.
I also guess that headers and exhaust would be good and give some extra hp as well?
Sorry no 2,5 16v build for this one!
A 996 is a nice car but had 2 already and the only models I would get is gt3 or turbo. The normal models are of no match for the 968 at track and modified turbos run equal times with our 968 at a much higher cost.
We also have a 951 and a 964 and the 968 is a keeper so we want to develop it to a better performer and kill some newer gt-cars!
Their kit doesn’t say anything about machining the pistons but why would this be desirable to do, lower compression?
Maybe their stage 1 connected with bigger injectors and a VEMS ecu.
I also guess that headers and exhaust would be good and give some extra hp as well?
Sorry no 2,5 16v build for this one!
A 996 is a nice car but had 2 already and the only models I would get is gt3 or turbo. The normal models are of no match for the 968 at track and modified turbos run equal times with our 968 at a much higher cost.
We also have a 951 and a 964 and the 968 is a keeper so we want to develop it to a better performer and kill some newer gt-cars!
T
09-27-2018, 12:09 PM
#12
Racer
Thread Starter
Same colors wohoo! 
I know about that build, not even supercharged but 3,2 liter and only high end parts.
That is THE reference engine...
But also a straight out race engine and we like to also drive the car on the street and on the way to the track.
So a bit more friendly setup.
/P
I know about that build, not even supercharged but 3,2 liter and only high end parts.
That is THE reference engine...
But also a straight out race engine and we like to also drive the car on the street and on the way to the track.
So a bit more friendly setup.
/P
09-27-2018, 05:58 PM
#13
Drifting
I also have similar power aspirations for my 968 - see my other thread - don’t want to muddy your discussion.
09-27-2018, 07:28 PM
#14
Race Car
Same colors wohoo!
I know about that build, not even supercharged but 3,2 liter and only high end parts.
That is THE reference engine...
But also a straight out race engine and we like to also drive the car on the street and on the way to the track.
So a bit more friendly setup.
/P
I know about that build, not even supercharged but 3,2 liter and only high end parts.
That is THE reference engine...
But also a straight out race engine and we like to also drive the car on the street and on the way to the track.
So a bit more friendly setup.
/P
In a series I used to race in for example, a 2.5l 944 NA engine's expected output was balanced by weight vs a 2.5T by a multiple of 1.4.
What I'm saying is, even if your end product is not on the level of Henk's (in the NA form), with much more affordable level of upgrades, even 10% over a stock 968 + an approximate +15 bhp per psi of boost will easily reach 300+ bhp.
T
09-27-2018, 07:47 PM
#15
Race Car
Please tell me more about the 996 vs 968 on the track. I test drove a 996 C4s on regular roads two weekends ago and really liked it and thought about selling my 968 for it. But then I got into my 968 and noticed something special about the car that the 996 just didn’t have. I may be biased though! I am interested in how they compare on the track.
I also have similar power aspirations for my 968 - see my other thread - don’t want to muddy your discussion.
A car that I am currently reconfiguring was originally being built with the intent to demonstrate that a 400 bhp 944T could compete with the 996 at the time while it was being built.
There is a RL'er here that raced and actively still races a 2.7L 944T in PCA that sat on pole position vs 996 GT3 class cars that I have witnessed in person and have pictures of that showed that it can be done.
This owner/driver mentored my son and is probably somewhat responsible for the level that my son races today.
If you put a capable car from the 944/968 family on track with a target of being in the top 5 with 4 996s being the other participants, I can tell you, you'd better be ready to bring it as a driver.
T