Does anyone have one of these vf23 - vf22???
09 June 2001, 12:18 PM
#3
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Ok so here is the deal, I just read an article saying that the vf22 gave 24 percent more horsepower mid range and 30 percent more high end power at the wheels than a vf23..... or was i reading this article wrong?
What are the gains of a vf22 >???
has anyone ever tried both???
cheers
nick
What are the gains of a vf22 >???
has anyone ever tried both???
cheers
nick
10 June 2001, 09:07 AM
#6
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Got an STi V - came with a VF28.
Changed to a VF22 after a bit of minor
engine work to a VF22.
The 22 does seem to have a whole lot more in the mid and top than the 28. Can't comment on actual power increase as it was done with a whole host of mods.
If Mr G who purchased it off me would like to comment, as he's now got it.
Cheers
Changed to a VF22 after a bit of minor
engine work to a VF22.The 22 does seem to have a whole lot more in the mid and top than the 28. Can't comment on actual power increase as it was done with a whole host of mods.
If Mr G who purchased it off me would like to comment, as he's now got it.
Cheers
10 June 2001, 09:50 AM
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(Posted this already before, now again with some extra information).
I had fixed a IHI VF23 turbo on my MY99 “standard UK”;
it had an open exhaust and a K&N panel-filter;
and the car is/was chip-tuned by EMS (a dutch tuner-mapper); boost was max 1.2 - 1.25 bar, in optimal weather circumstances sometimes 1.3 bar peak.
After fixing the VF23 a bit re-tuning kept the turbo-boost at exact the same values: 1.2 – 1.3 bar maximum.
After the mod, the car had a bit more turbo-gap, but feels quicker specially at high rev’s.
I liked this mod immediately; but wanted also some more objective feedback than just the “good feel”.
So I did some speed-timing.
First with the standard TD04L turbo, than next day with the VF23 after 100-150 miles running-in.
It was on the same road, timing in both directions. The second day a bit less weather-circumstances and a bit more weight (plm 20 kg gas) in the car.
Timing: went up till given speed, steady and than full-throttle while starting the stopwatch.
Timing each speed-range 4 or 5 times to get ‘mean’ figures.
Results:
speed* -- gear -- RPM -- time with st-turbo -- time witt VF23
80 - 120 (3): 3500-5400 3.4 - 3.6 ..... 3.1 - 3.4 sec
80 - 120 (4): 2500-3800 4.9 - 5.3 ..... 5.1 - 5.4
80 - 180 (4): 2500-5800 11.9 - 12.2 ..... 11.9 - 12.4
80 - 180 (5): 1900-4300 17.9 - 18.3 ..... 20.5 - 20.7
120 - 180 (4): 3800-5800 7.1 - 7.5 ..... 6.7 - 7.0
120 - 180 (5): 2900-4300 10.0 - 10.3 ..... 9.9 - 10.6
100 - 160 (4): 3150-5200 6.9 - 7.3 ..... 6.9 - 7.3
100 - 200 (4): 3150-6400 12.6 - 13.2 ..... 12.5 - 12.7
120 - 200 (4): 3800-6400 10.1 - 10.6 ..... 9.6 - 9.7
* speed as speedo says; thus not real speed (= not important for comparing, same distortion).
Some conclusions:
· till plm 3000 rpm st-turbo is quicker, between 3000 and 4000 about the same, and above 4000 rpm VF23 is really more powerful.
· Although the difference the in figures is not shocking, half a second between 120 and 200 km/h is 20-30 meters alongside another car.
· I liked to have some more comparing in really high rev’s; pity, didn’t do it the first day. Specially speeds above 200 km/h are different now, and topspeed is higher.
· With VF23 the car can keep up boost (much) better in high rev’s, above 5500-6000 rpm, bit more than 1,0 bar till 6500 rpm and up.
· When you drive the car always above 3500 rpm you have a really quicker car; I did this with other EMS-tuned scoobs, mine is faster now than the others, before about the same.
But it’s clear that such nice big turbo deserves better chip-tuning/mapping, specially in low revs. Such mapping (with Link, Motec or Unichip) can make the car much better picking-up.
Theo-EvilBevel did it with his scooby (by EMS with Uni-chip), and his car now is really a monster!!
Some time ago we compared different car's on the Autobahn in the speedrange REAL 100 - 200 km/h (in every car we knew exactly wat was real 100 and real 200; did this with stopwatch, a timetable and km-signs along the autobahn; around speedo 107 most times was real 100, around speedo 215 most cars was real 200).
Also a EVO-6 and a sub modified by DigitPower.
Besides the stopwatch we also used the AP22 Performance-meter.
Theo's car (with VF23 and specially mapped Unichip) was the quickest:
100-200 km/h in 12,5 - 13 sec;
my car with VF23 and the "old" EMS-mapping, went around 15 - 15,5 sec.
The standard EVO-6 did the same, around 15,5 sec (my car was just a bit faster).
An EMS-chipped car, with open exhaust and with the standard turbo did around 16,5 sec.
A standard UK-car did 22-23 sec.
The DigitPower-sub was between Theo's car and mine.
We also did a copple of 0 - 200 km/h and with Theo's car you can do it in 17,5 - 18 sec's. Thats better than a M3, and in the sane range as an Audi RS4 or a normal 911!
Next week I will get the Unichip, mapped by Mark Verhoeven (EMS) and have the same "monster-car"
, as Theo.
We think with this mod the car has around 290-295 bhp (on an optimistic RR maeby over 300bhp :lol ). But how to get exact power-figures?
I think real-world timing with a stopwatch, checked speedo, in controled road and weather conditions gives as good (or better...) an idea over power-gain!!
Geert
[This message has been edited by psyg (edited 10 June 2001).]
I had fixed a IHI VF23 turbo on my MY99 “standard UK”;
it had an open exhaust and a K&N panel-filter;
and the car is/was chip-tuned by EMS (a dutch tuner-mapper); boost was max 1.2 - 1.25 bar, in optimal weather circumstances sometimes 1.3 bar peak.
After fixing the VF23 a bit re-tuning kept the turbo-boost at exact the same values: 1.2 – 1.3 bar maximum.
After the mod, the car had a bit more turbo-gap, but feels quicker specially at high rev’s.
I liked this mod immediately; but wanted also some more objective feedback than just the “good feel”.
So I did some speed-timing.
First with the standard TD04L turbo, than next day with the VF23 after 100-150 miles running-in.
It was on the same road, timing in both directions. The second day a bit less weather-circumstances and a bit more weight (plm 20 kg gas) in the car.
Timing: went up till given speed, steady and than full-throttle while starting the stopwatch.
Timing each speed-range 4 or 5 times to get ‘mean’ figures.
Results:
speed* -- gear -- RPM -- time with st-turbo -- time witt VF23
80 - 120 (3): 3500-5400 3.4 - 3.6 ..... 3.1 - 3.4 sec
80 - 120 (4): 2500-3800 4.9 - 5.3 ..... 5.1 - 5.4
80 - 180 (4): 2500-5800 11.9 - 12.2 ..... 11.9 - 12.4
80 - 180 (5): 1900-4300 17.9 - 18.3 ..... 20.5 - 20.7
120 - 180 (4): 3800-5800 7.1 - 7.5 ..... 6.7 - 7.0
120 - 180 (5): 2900-4300 10.0 - 10.3 ..... 9.9 - 10.6
100 - 160 (4): 3150-5200 6.9 - 7.3 ..... 6.9 - 7.3
100 - 200 (4): 3150-6400 12.6 - 13.2 ..... 12.5 - 12.7
120 - 200 (4): 3800-6400 10.1 - 10.6 ..... 9.6 - 9.7
* speed as speedo says; thus not real speed (= not important for comparing, same distortion).
Some conclusions:
· till plm 3000 rpm st-turbo is quicker, between 3000 and 4000 about the same, and above 4000 rpm VF23 is really more powerful.
· Although the difference the in figures is not shocking, half a second between 120 and 200 km/h is 20-30 meters alongside another car.
· I liked to have some more comparing in really high rev’s; pity, didn’t do it the first day. Specially speeds above 200 km/h are different now, and topspeed is higher.
· With VF23 the car can keep up boost (much) better in high rev’s, above 5500-6000 rpm, bit more than 1,0 bar till 6500 rpm and up.
· When you drive the car always above 3500 rpm you have a really quicker car; I did this with other EMS-tuned scoobs, mine is faster now than the others, before about the same.
But it’s clear that such nice big turbo deserves better chip-tuning/mapping, specially in low revs. Such mapping (with Link, Motec or Unichip) can make the car much better picking-up.
Theo-EvilBevel did it with his scooby (by EMS with Uni-chip), and his car now is really a monster!!
Some time ago we compared different car's on the Autobahn in the speedrange REAL 100 - 200 km/h (in every car we knew exactly wat was real 100 and real 200; did this with stopwatch, a timetable and km-signs along the autobahn; around speedo 107 most times was real 100, around speedo 215 most cars was real 200).
Also a EVO-6 and a sub modified by DigitPower.
Besides the stopwatch we also used the AP22 Performance-meter.
Theo's car (with VF23 and specially mapped Unichip) was the quickest:
100-200 km/h in 12,5 - 13 sec;
my car with VF23 and the "old" EMS-mapping, went around 15 - 15,5 sec.
The standard EVO-6 did the same, around 15,5 sec (my car was just a bit faster).
An EMS-chipped car, with open exhaust and with the standard turbo did around 16,5 sec.
A standard UK-car did 22-23 sec.
The DigitPower-sub was between Theo's car and mine.
We also did a copple of 0 - 200 km/h and with Theo's car you can do it in 17,5 - 18 sec's. Thats better than a M3, and in the sane range as an Audi RS4 or a normal 911!
Next week I will get the Unichip, mapped by Mark Verhoeven (EMS) and have the same "monster-car"
, as Theo.We think with this mod the car has around 290-295 bhp (on an optimistic RR maeby over 300bhp :lol ). But how to get exact power-figures?
I think real-world timing with a stopwatch, checked speedo, in controled road and weather conditions gives as good (or better...) an idea over power-gain!!
Geert
[This message has been edited by psyg (edited 10 June 2001).]
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