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optima21 wrote:right I've been out for a play and here are the lb/ft torque at different rpms

RPM .........GT........NZ
2000.........35.........55
2500..........66........67
3000..........71........72
3500..........71........74
4000..........73........77

with the GT manifold my peak torque was 74 lb/ft @ 4200 rpm and peak power was 80 bph @ 5900 rpm

with the NZ manifold my peak torque was 78 lb/ft @ 3900 rpm and peak power was 74 bhp @ 6000 rpm

of course thats on my car but on others it will be different (depending on mods), and I'm losing some power somewhere, as the car is with a chip, 4 branch manifold and sports system, golf AFM and drilled airbox.

heres some more torque figures

RPM.........GT........NZ
4500........72........76
5000........71........74
5500........71........71

ohh I guess you'll want the bhp figures too :-

RPM........GT........NZ
2000.......14........21
3000.......38........41
4000.......55........58
5000.......67........68

ohh if you're wondering how I got these figures? I got one one of these

road dyno and it worked out be about £96.

now the figures it spits out may be wrong due to the variables that I've used, but that doesnt matter as I'm not altering them between setups, so they are still useful for comparison.

well if the post delivered today i would hopefully of been adding a decat and straight through pipe to my car but no! bloody bank holiday!

any chance you could record some figures higher up the rpm range dom?

also if anyone wants to sell a 3f cam... (268 upwards prefered) i'm interested.

yoof

Yeah, like a reading at 7000rpm would be good!!

Just kidding!!

It would be interesting to see power and torque figures for higher rpm - like at 5500rpm, 6000rpm and 6500rpm. A stock GT's peak power's at 5900rpm isn't it? So worth seeing what's going on higher up in the revs.

Dom - I thought you can get graphs from the dyno, is there any way of superimposing the NZ one onto a GT one?

well I've gone to about 6500 rpm, but when the power drops it doesnt show the figures. I would take it upto 7k rpm but its already well past its peak.

the figures I've given are also altered if there is a peak (from hitting a bump) but I only smooth them out to show the trend.

I'd have to put the figures into a spreadsheet to create a graph, but here are the figures the graphs I've got are worked out from

GT manifold

RPM Torque HP
--------------
1500 ---- ----
1600 ---- ----
1700 ---- ----
1800 ---- ----
1900 23 8
2000 35 14
2100 46 19
2200 55 23
2300 60 26
2400 64 29
2500 66 31
2600 66 33
2700 67 35
2800 68 37
2900 70 39
3000 72 41
3100 71 42
3200 71 43
3300 70 44
3400 71 46
3500 72 48
3600 74 50
3700 74 52
3800 73 53
3900 72 54
4000 73 55
4100 74 58
4200 74 59
4300 73 60
4400 72 60
4500 72 62
4600 77 68
4700 81 73
4800 82 75
4900 76 71
5000 71 67
5100 70 69
5200 71 70
5300 72 72
5400 70 72
5500 71 75
5600 71 76
5700 72 78
5800 72 79
5900 72 80
6000 68 77
6100 59 69

NZ manifold

RPM Torque HP
--------------
1500 7 2
1600 20 6
1700 32 11
1800 42 15
1900 50 18
2000 55 21
2100 58 23
2200 61 26
2300 63 28
2400 65 30
2500 67 32
2600 69 34
2700 70 36
2800 71 38
2900 72 39
3000 72 41
3100 73 43
3200 74 45
3300 74 46
3400 75 48
3500 74 50
3600 76 52
3700 77 54
3800 78 57
3900 78 58
4000 77 58
4100 76 60
4200 77 62
4300 79 65
4400 78 65
4500 77 66
4600 75 65
4700 75 67
4800 74 68
4900 74 69
5000 72 68
5100 78 76
5200 82 82
5300 87 88
5400 76 78
5500 71 74
5600 64 68
5700 66 71
5800 65 72
5900 65 73
6000 65 74
6100 63 73
6200 58 68

Blimey, in that instance NZ appears the way to go!

Just for comparisons sake, my adx mk4 made 84 lb ft at 2950 rpm totally standard.




132k with slight downhill assistance hit the limiter in 5th today, standard but for one of Dan's chips. The 16v Corrado didn't pull away until that point...

I tried running a tooth either way onthe cambelt on my cam but when I turned the GT over by hande the valves hit the pistons! So the filing the dizzy mount the only way.

very interesting about the inlet manifold difference, have you done any calculations on the optimum inlet runner size on the GT?

poloace wrote:I tried running a tooth either way onthe cambelt on my cam but when I turned the GT over by hande the valves hit the pistons! So the filing the dizzy mount the only way.

very interesting about the inlet manifold difference, have you done any calculations on the optimum inlet runner size on the GT?

Crazy, why should that be?! Maybe time for a 'cam' chip

Just typed up Dom figures in Excel, It looks like you device is getting soeminterference as teh spikes look a bit suspect to me as the amount rate of power increase looks a bit high to be real? I may treat myself to one of those devices as my accelertometer device can display power but traction issues results in more errors.

pretty close to call, that one - an extra few packets of crisps or different amount of fuel might have made the difference in this case!

think i'd quite easily pick the NZ manifold over the GT though - there's a couple more HP on offer when you're really pounding it (which a dewedge/rechip might recoup anyway) but there's a little extra power (apparently...) through the rest of the range, and it picks up a whole lot earlier. for what percentage of the time are you actually over 5500 on most drives, and how much of the time building up to it?

yeah Alan those graphs look like the ones I had, but there are notany really smooth and flat roads that are suitable near where I live, but they the runs were done 3 days apart with similar weather conditions, on the same peice of road in the same direction and the car wasnt driven between changing the manifold.

well teh idea behind how it works is that you let it run about 1500 rpm in second gear then floor it for the power run, but hey I dont even know if I'm putting my foot down right.... I mean you cant just floor it, or else the engine bogs down.

optima, I can imagine its hard to get rebeatable runs as there are so many variables, I expect your about 10% accurate with those figures, power torque measurements are hard to get the F!1 teams were well pleased with are better than 1% accuracy on our Torque sensors I used to build for the firm I used to work for.

I think all GT cams need a vernier pulley to setup the engine dead right I thnk Paul cauldwell how had my cam in his NZ made had a 5bhp improvement when he had that cam of mine setup with a vernier pulley on a RR.

When I get some time I am going to fiddle with the GT chips a bit more.