If I fitted a supercharger....
Discussion
Ok so my car hit 160 which I am very please with.
Now TPC do a supercharger for my car its running around 260BHP now they claim with a charge cooler it can get 350BHP I think its about 6k fitted
Now as I understand it (although I am probably wrong) the top speed is to do with gearing. Would a relatively huge jump in HP have an impact on top speed or just accereration?
Cheers
Now TPC do a supercharger for my car its running around 260BHP now they claim with a charge cooler it can get 350BHP I think its about 6k fitted
Now as I understand it (although I am probably wrong) the top speed is to do with gearing. Would a relatively huge jump in HP have an impact on top speed or just accereration?
Cheers
Both 
Not sure what the gearing is on a 964 - did you have time to look at the revs as you went through the lights?
Top speed will be limited by the gearing to whatever speed you are doing at the red line in top - I think there is a graph in the back of the owners manual that will give the numbers
Not sure what the gearing is on a 964 - did you have time to look at the revs as you went through the lights?
Top speed will be limited by the gearing to whatever speed you are doing at the red line in top - I think there is a graph in the back of the owners manual that will give the numbers
Burrow01 said:
- did you have time to look at the revs as you went through the lights?
No too busy target fixating on the green bank at the end although I had plenty of time to stop will pay attention to it next time.
are you saying that theoretically in top gear if the best the 260bhp could manage was 6k revs with the extra BHP the engine would be able to push it all the way to 7k rev limit and therefore increase the top speed by whatever 1k revs is ?
sorry that makes sense in my head probably rubish.
It also depends on what type of blower you opt for.
A PD blower will give you loads of torque at the lower rev range, so you'll be able to use a taller gear, but its not as good at the higher rev range ie holding a gear to the limiter.
A centrifugal blower is basically a belt driven turbo so has far less torque low down but gives cleaner power at the top end.
For Vmax you'll be wanting a centri blower. (I swapped out my PD Blower setup for something else when I realised its limitations).
Pop over to the HSV forum and ask yur question there, we all seem to be either blown or cammed there so there's a lot of useful first hand experience type of guys there
A PD blower will give you loads of torque at the lower rev range, so you'll be able to use a taller gear, but its not as good at the higher rev range ie holding a gear to the limiter.
A centrifugal blower is basically a belt driven turbo so has far less torque low down but gives cleaner power at the top end.
For Vmax you'll be wanting a centri blower. (I swapped out my PD Blower setup for something else when I realised its limitations).
Pop over to the HSV forum and ask yur question there, we all seem to be either blown or cammed there so there's a lot of useful first hand experience type of guys there
this is the kit by the way.
pity the £ is week against the $ at the moment
http://www.tpcracing.com/products/Porsche-964-and-...
pity the £ is week against the $ at the moment
http://www.tpcracing.com/products/Porsche-964-and-...
crisisjez said:
It also depends on what type of blower you opt for.
A PD blower will give you loads of torque at the lower rev range, so you'll be able to use a taller gear, but its not as good at the higher rev range ie holding a gear to the limiter.
A centrifugal blower is basically a belt driven turbo so has far less torque low down but gives cleaner power at the top end.
For Vmax you'll be wanting a centri blower. (I swapped out my PD Blower setup for something else when I realised its limitations).
Pop over to the HSV forum and ask yur question there, we all seem to be either blown or cammed there so there's a lot of useful first hand experience type of guys there
I new it wouldnt be that bloody simple A PD blower will give you loads of torque at the lower rev range, so you'll be able to use a taller gear, but its not as good at the higher rev range ie holding a gear to the limiter.
A centrifugal blower is basically a belt driven turbo so has far less torque low down but gives cleaner power at the top end.
For Vmax you'll be wanting a centri blower. (I swapped out my PD Blower setup for something else when I realised its limitations).
Pop over to the HSV forum and ask yur question there, we all seem to be either blown or cammed there so there's a lot of useful first hand experience type of guys there
looking at this graph it seems that pwoer drops off at 6.6-7k
Edited by Pesty on Monday 15th March 19:03
Pesty said:
are you saying that theoretically in top gear if the best the 260bhp could manage was 6k revs with the extra BHP the engine would be able to push it all the way to 7k rev limit and therefore increase the top speed by whatever 1k revs is ?
Only way you're going to go quicker after that is raise the redline (with suitable hardware of course) or change the gearing..
Always amuses me to see these threads post-VMax..
Yeah thats a PD blower, mega for roadwork and short blasts. But for Vmax I'd look toward a centri(Vortec) blower.
Heat is the biggest killer of FI and the PD blowers produce it by the bucketload.
The blower you are looking at is last gen now, you should only be looking at the TVS equivilent (All of these regardless of manufacture are based around the Eaton rotors and the new TVS rotor pack is a substantial improvement over the old stuff.)
With the way these blowers are designed there is very little chance of effective intercooling.
Heat is the biggest killer of FI and the PD blowers produce it by the bucketload.
The blower you are looking at is last gen now, you should only be looking at the TVS equivilent (All of these regardless of manufacture are based around the Eaton rotors and the new TVS rotor pack is a substantial improvement over the old stuff.)
With the way these blowers are designed there is very little chance of effective intercooling.
Edited by crisisjez on Thursday 18th March 17:18
just thinking out loud I have fitted a couple of these kits with ok results they do what they say on the tin, but as stated they are very dated now. We have also fitted a few Vortech superchargers with good results (not to a porsche though) the big questions is how badly do you want it and how deep are you pockets because every 10mph from now on is going to coast alot of money in both gearbox and engine upgrades.
kind regards jamie
kind regards jamie
My pockets are shallow otherwise I would already be trying to buy that Orange beast that was there or impulse bought a supercharger already.
V max events aside top speed is not really my priority extra low down grunt a supercharger provides would be quite nice for every day
I had planned to keep this car for a long time( I probably will) in that case some modifications may be on the cards in future.
V max events aside top speed is not really my priority extra low down grunt a supercharger provides would be quite nice
for every dayI had planned to keep this car for a long time( I probably will) in that case some modifications may be on the cards in future.
Pesty said:
My pockets are shallow otherwise I would already be trying to buy that Orange beast that was there or impulse bought a supercharger already.
V max events aside top speed is not really my priority extra low down grunt a supercharger provides would be quite nice for every day
I had planned to keep this car for a long time( I probably will) in that case some modifications may be on the cards in future.
Having caught the Vmax bug badly my advice is leave the car as it is and get something else OE if you really want to go fast. V max events aside top speed is not really my priority extra low down grunt a supercharger provides would be quite nice
for every dayI had planned to keep this car for a long time( I probably will) in that case some modifications may be on the cards in future.
Superchargers rarely give more grunt down low compared with the right turbos due to the fact they spin off the engine and need high engine speed to achive maximum boost (this is were 99% of the time max torque is achived) were as 2x k16 turbos on your car set right will be much faster with much better torque down low, but as with both turbo & supercharger you are limited by your engines ability to handle torque befor it s
ts its self so with my thinking head on id say if you want to go faster buy something else.
kind regards j
ts its self so with my thinking head on id say if you want to go faster buy something else.kind regards j
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