XCal2 impressions and results
Thread Starter
|
Senior Member
Joined: Jul 2005
Posts: 575
Likes: 0
From: Oronoco, MN
XCal2 impressions and results
After finally getting everything back together and running, here's a few performance results. Hand timing is definately not a scientific method, but all results are at least a two run average and are very repeatable....
The truck is a 2001 F150 Screw 2wd Roush with a 5.4, no blower, 44k miles. The only power mods from Roush were a Flowmaster cat-back and K&N inlet pipe, first test is that combo on 87 octane....
0-60 8 sec.
0-100 21 sec.
Test 2, rebuilt motor after it spun a couple bearings, ported the heads, and used 4.6 Cobra pistons to arrive at 9.8:1. Those are the only changes, still on 87 octane as I had a tankful when I tore it down, computer was likely pulling some timing with the higher compression and cheap gas...
0-60 7.3 sec.
0-100 18.95 sec.
Definately some power to be gained in the heads on these motors!
Test 3, installed 24lb injectors, an '03 Cobra 90mm MAF, and a Troyer XCAL2, now running 91 octane and my 91 octane performance tune...
0-60 6.9 sec.
0-100 17 sec.
Still need to datalog and tweak the tune, might be a little left as a/f ratio is a bit uncertain right now after changing the air meter, can't be too far off though with it running that well.
One note in the interest of honesty, all times are likely a few tenths low as I've found that Roush put a shorter wheel/tire combo on without correcting for it, so when I click the stopwatch at 60/100 the truck isn't really quite there yet. Troyer corrected the tire size in my programs, so in order to get a consistent comparison for test 3 I entered the stock (incorrect) tire size in the XCAL2 before test 3 so the error factor would be the same as the other tests. So, the numbers may all be a bit low but the performance gains between each test are an accurate reflection of gains.
XCAL2 impressions: very slick device, loaded the 87 tow tune first and didn't notice any real difference for power, but didn't expect too as a tow tune for 87 octane with 9.8:1 compression can't be too aggressive for timing. Noticed more of a diffence with the 91 octane performance tune, nothing radical for power or shifting, but part throttle feels much stronger. Judging by the performace results there a definite power increase, just didn't feel like that much initially, but thats why we don't use butt-dynos....
There is only one little negative trait, when I let off the gas slightly on the highway or tap my cruise off I get a second of hard engine braking like fuel flow has been shut off, then it comes back normal. I have a feeling it may be a result of swapping the air meter, and after datalogging and logging a/f to tweak the transfer function that may well go away. Overall I'm very satisfied with the performance gains, hope to get the truck on a Dynojet in the next few weeks and get the a/f ratio checked.
The truck is a 2001 F150 Screw 2wd Roush with a 5.4, no blower, 44k miles. The only power mods from Roush were a Flowmaster cat-back and K&N inlet pipe, first test is that combo on 87 octane....
0-60 8 sec.
0-100 21 sec.
Test 2, rebuilt motor after it spun a couple bearings, ported the heads, and used 4.6 Cobra pistons to arrive at 9.8:1. Those are the only changes, still on 87 octane as I had a tankful when I tore it down, computer was likely pulling some timing with the higher compression and cheap gas...
0-60 7.3 sec.
0-100 18.95 sec.
Definately some power to be gained in the heads on these motors!
Test 3, installed 24lb injectors, an '03 Cobra 90mm MAF, and a Troyer XCAL2, now running 91 octane and my 91 octane performance tune...
0-60 6.9 sec.
0-100 17 sec.
Still need to datalog and tweak the tune, might be a little left as a/f ratio is a bit uncertain right now after changing the air meter, can't be too far off though with it running that well.
One note in the interest of honesty, all times are likely a few tenths low as I've found that Roush put a shorter wheel/tire combo on without correcting for it, so when I click the stopwatch at 60/100 the truck isn't really quite there yet. Troyer corrected the tire size in my programs, so in order to get a consistent comparison for test 3 I entered the stock (incorrect) tire size in the XCAL2 before test 3 so the error factor would be the same as the other tests. So, the numbers may all be a bit low but the performance gains between each test are an accurate reflection of gains.
XCAL2 impressions: very slick device, loaded the 87 tow tune first and didn't notice any real difference for power, but didn't expect too as a tow tune for 87 octane with 9.8:1 compression can't be too aggressive for timing. Noticed more of a diffence with the 91 octane performance tune, nothing radical for power or shifting, but part throttle feels much stronger. Judging by the performace results there a definite power increase, just didn't feel like that much initially, but thats why we don't use butt-dynos....
There is only one little negative trait, when I let off the gas slightly on the highway or tap my cruise off I get a second of hard engine braking like fuel flow has been shut off, then it comes back normal. I have a feeling it may be a result of swapping the air meter, and after datalogging and logging a/f to tweak the transfer function that may well go away. Overall I'm very satisfied with the performance gains, hope to get the truck on a Dynojet in the next few weeks and get the a/f ratio checked.