anyone wanna help me with some maths???
03-11-2004, 11:03 PM
#1
Junior Member
Thread Starter
Join Date: Jan 2001
Posts: 579
Likes: 0
Received 0 Likes
on
0 Posts
anyone wanna help me with some maths???
i can't find a 4wd dyno here in vancouver canada. so i am stuck guessing what hp i am making.
the relevant data i have,
before upgrade:
APR chip, exhaust, cone filter.
MAX MAF recorded = 148 g/s (lets say this = WHP)
with APR chip alone i was to make 209 CHP.
so that gives me drivetrain loss of 29.2% lets say 30% and its pretty close for quattro TT.
after gt25/40r running 20psi boost,
still apr chip /w split sec VC1 and PSC001 running on the rich side,
MAX MAF = 256 g/s (corrected)
so what, that gives me 256 WHP and 365 CHP??
if anyone knows a better way to estimate, let me know.
the relevant data i have,
before upgrade:
APR chip, exhaust, cone filter.
MAX MAF recorded = 148 g/s (lets say this = WHP)
with APR chip alone i was to make 209 CHP.
so that gives me drivetrain loss of 29.2% lets say 30% and its pretty close for quattro TT.
after gt25/40r running 20psi boost,
still apr chip /w split sec VC1 and PSC001 running on the rich side,
MAX MAF = 256 g/s (corrected)
so what, that gives me 256 WHP and 365 CHP??
if anyone knows a better way to estimate, let me know.
03-12-2004, 08:51 AM
#2
You could weigh your car and go to the drag strip....
I would say go off a known value, like the stock ratings.
See what a stock reading is for your car. Then compare that to the stock BHP. Then just figure the differecne in air flow and relate it to BHP.
With the GT25 you have 256 g/s.
Air flow change:
(256-STOCK MAF)/STOCK MAF = air flow change
So you're new HP would roughly be:
(1+air flow change)*STOCK BHP = NEW BHP
Of course this is highly inaccurate with timing changes, et al., but it's a start.
See what a stock reading is for your car. Then compare that to the stock BHP. Then just figure the differecne in air flow and relate it to BHP.
With the GT25 you have 256 g/s.
Air flow change:
(256-STOCK MAF)/STOCK MAF = air flow change
So you're new HP would roughly be:
(1+air flow change)*STOCK BHP = NEW BHP
Of course this is highly inaccurate with timing changes, et al., but it's a start.
03-12-2004, 08:00 PM
#5
Elder Member
Join Date: Sep 2002
Posts: 14,366
Likes: 0
Received 0 Likes
on
0 Posts
There is a vag block that will give you an idea of the tq your making.
You cant really go by the maf readings since the readings can be changed within the chip to what the 5 volt reading is equal to.
How do you get 30% for a TT that is not really awd since it is fwd based and only puts power down to the rear wheels when traction is lost at the front. With the quattro A4's we tend to use a 22-25% drive line loss and we are AWD all the time.
How do you get 30% for a TT that is not really awd since it is fwd based and only puts power down to the rear wheels when traction is lost at the front. With the quattro A4's we tend to use a 22-25% drive line loss and we are AWD all the time.
03-12-2004, 11:22 PM
#6
Junior Member
Thread Starter
Join Date: Jan 2001
Posts: 579
Likes: 0
Received 0 Likes
on
0 Posts
hmm i guess i am stuck guessing till i go down usa for dyno.. which is too much for me.
1.8T engine running 19psi redline with atp gt28rs was making 310whp, about 350chp according someone on vortex. very similar setup regarding fuel, maf, and running rich etc.
i am running 22psi to redline, so i can only guess that i am making 380chp+ so that leaves me 300whp if i take 25% drivetrain loss.
i am running 22psi to redline, so i can only guess that i am making 380chp+ so that leaves me 300whp if i take 25% drivetrain loss.
03-12-2004, 11:30 PM
#7
Junior Member
Thread Starter
Join Date: Jan 2001
Posts: 579
Likes: 0
Received 0 Likes
on
0 Posts
so i am getting 33.83lb/min = 373chp so close to my 365chp guess
anyway now i am pushing 2lbs more, so about 22lbs so i m must be over 380chp. guess it stops here. my original goal was 350chp.
