TPI Combo - Low Dyno Results
10-10-2015, 07:04 PM
#51
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Re: TPI Combo - Low Dyno Results
To flow all eight will cost
Flowing 2 prior to then after providing they are using calipers/propering measuring tools youll probably be Ok. Hard for me as I get ocd and make a career out of those stupid things lol. Porting those is a rediculous amount of work to do one right, most shops wont come near them. About 10 yrs ago I aske a shop about doing one...wanted 850 and didnt really want to do it. Thats where I started up...
Flowing 2 prior to then after providing they are using calipers/propering measuring tools youll probably be Ok. Hard for me as I get ocd and make a career out of those stupid things lol. Porting those is a rediculous amount of work to do one right, most shops wont come near them. About 10 yrs ago I aske a shop about doing one...wanted 850 and didnt really want to do it. Thats where I started up...
12-10-2015, 11:14 PM
#52
Re: TPI Combo - Low Dyno Results
To flow all eight will cost. Flowing 2 prior to then after providing they are using calipers/proper measuring tools you'll probably be Ok. Hard for me as I get ocd and make a career out of those stupid things lol. Porting those is a ridiculous amount of work to do one right, most shops won't come near them. About 10 yrs ago I asked a shop about doing one...wanted 850 and didn't really want to do it. Thats where I started up...
(No way of really knowing unless I have all the ports flowed. Therefore, Ignorance is Bliss)Really hoping to see some gains on the Dyno!
Valve Lift CFM Head Flow Before Porting After Porting
0.100 66 64 65
0.200 121 117 119
0.300 182 177 183
0.400 231 213 225
0.500 264 235 253
0.600 275 241 262
12-12-2015, 03:03 PM
#53
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Re: TPI Combo - Low Dyno Results
The build as you described it should produce much better numbers than you attained. I did a similar build with a '90 L98, it is also a 700r4 but with speed density not MAF. My post build numbers were unbelievably low 244hp and 338tq at the wheels.
I spent 8 months obsessed with trying to locate the cause of my lost HP/TQ. Tore it down, checked everything, put it back together again. Back to the dyno. Threw parts at it. Back to the dyno. Tuned and re-tuned, back and forth to the dyno. Thoroughly pissed off, almost ready to give the car away in disgust, I moved on to the next mod. Swapping the 700r4 for a T5.
Unexpected results. With the T5 installed the dyno showed an increase to 289rwhp and 398rwtq. No other mods/changes.
What I concluded is in some way the combination of performance mods and 7004r were incompatible. I never got to the bottom of it, never did figure out why, I did not care.
Not saying your 700r4 is your issue, just saying it was my issue and I never suspected it.
...
I spent 8 months obsessed with trying to locate the cause of my lost HP/TQ. Tore it down, checked everything, put it back together again. Back to the dyno. Threw parts at it. Back to the dyno. Tuned and re-tuned, back and forth to the dyno. Thoroughly pissed off, almost ready to give the car away in disgust, I moved on to the next mod. Swapping the 700r4 for a T5.
Unexpected results. With the T5 installed the dyno showed an increase to 289rwhp and 398rwtq. No other mods/changes.
What I concluded is in some way the combination of performance mods and 7004r were incompatible. I never got to the bottom of it, never did figure out why, I did not care.
Not saying your 700r4 is your issue, just saying it was my issue and I never suspected it.
...
Last edited by palric; 12-12-2015 at 03:06 PM.
12-17-2015, 03:00 AM
#56
Re: TPI Combo - Low Dyno Results
The build as you described it should produce much better numbers than you attained. I did a similar build with a '90 L98, it is also a 700R4 but with speed density not MAF. My post build numbers were unbelievably low 244hp and 338tq at the wheels.
I spent 8 months obsessed with trying to locate the cause of my lost HP/TQ. Tore it down, checked everything, put it back together again. Back to the dyno. Threw parts at it. Back to the dyno. Tuned and re-tuned, back and forth to the dyno. Thoroughly pissed off, almost ready to give the car away in disgust, I moved on to the next mod. Swapping the 700R4 for a T5.
Unexpected results. With the T5 installed the dyno showed an increase to 289rwhp and 398rwtq. No other mods/changes.
What I concluded is in some way the combination of performance mods and 700R4 were incompatible. I never got to the bottom of it, never did figure out why, I did not care.
Not saying your 700R4 is your issue, just saying it was my issue and I never suspected it.
...
I spent 8 months obsessed with trying to locate the cause of my lost HP/TQ. Tore it down, checked everything, put it back together again. Back to the dyno. Threw parts at it. Back to the dyno. Tuned and re-tuned, back and forth to the dyno. Thoroughly pissed off, almost ready to give the car away in disgust, I moved on to the next mod. Swapping the 700R4 for a T5.
Unexpected results. With the T5 installed the dyno showed an increase to 289rwhp and 398rwtq. No other mods/changes.
What I concluded is in some way the combination of performance mods and 700R4 were incompatible. I never got to the bottom of it, never did figure out why, I did not care.
Not saying your 700R4 is your issue, just saying it was my issue and I never suspected it.
...
I'd definitely like to switch to a manual transmission in the future (hopefully sometime in the near future).
12-19-2015, 01:26 PM
#57
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Re: TPI Combo - Low Dyno Results
The build as you described it should produce much better numbers than you attained. I did a similar build with a '90 L98, it is also a 700r4 but with speed density not MAF. My post build numbers were unbelievably low 244hp and 338tq at the wheels.
I spent 8 months obsessed with trying to locate the cause of my lost HP/TQ. Tore it down, checked everything, put it back together again. Back to the dyno. Threw parts at it. Back to the dyno. Tuned and re-tuned, back and forth to the dyno. Thoroughly pissed off, almost ready to give the car away in disgust, I moved on to the next mod. Swapping the 700r4 for a T5.
Unexpected results. With the T5 installed the dyno showed an increase to 289rwhp and 398rwtq. No other mods/changes.
What I concluded is in some way the combination of performance mods and 7004r were incompatible. I never got to the bottom of it, never did figure out why, I did not care.
Not saying your 700r4 is your issue, just saying it was my issue and I never suspected it.
...
I spent 8 months obsessed with trying to locate the cause of my lost HP/TQ. Tore it down, checked everything, put it back together again. Back to the dyno. Threw parts at it. Back to the dyno. Tuned and re-tuned, back and forth to the dyno. Thoroughly pissed off, almost ready to give the car away in disgust, I moved on to the next mod. Swapping the 700r4 for a T5.
Unexpected results. With the T5 installed the dyno showed an increase to 289rwhp and 398rwtq. No other mods/changes.
What I concluded is in some way the combination of performance mods and 7004r were incompatible. I never got to the bottom of it, never did figure out why, I did not care.
Not saying your 700r4 is your issue, just saying it was my issue and I never suspected it.
...
12-27-2015, 10:30 PM
#61
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Re: TPI Combo - Low Dyno Results
Pictures can't tell the whole story, but those look as good or better as any I've seen on this board over the last 15+yrs. Who did it? Based on your results you will drive me to pull apart my good running vortec set up and port the base. That seems to be the key to a TPI making any real power at all.
12-31-2015, 10:34 AM
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Re: TPI Combo - Low Dyno Results
That end of the base was never the problem.
The head side of the base is where the restriction is.
Bring it by and I will measure it and tell you if it is good or not.
The narrow part is 1 1/2" - 2" inside the head side.
The head side of the base is where the restriction is.
Bring it by and I will measure it and tell you if it is good or not.
The narrow part is 1 1/2" - 2" inside the head side.
01-01-2016, 10:38 AM
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Re: TPI Combo - Low Dyno Results
.....
01-04-2016, 02:12 PM
#65
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Re: TPI Combo - Low Dyno Results
No problem, I wish I could have had better news for you tho.
At best is is 1.7 sq. in. on the head side, it is 2.3 or better on the runner side. it needs to be around 2.3 to flow upwards of 300 cfm.
A regular 4 barrel manifold flows around 320 so you need that much to make a TPI
make good power.
At best is is 1.7 sq. in. on the head side, it is 2.3 or better on the runner side. it needs to be around 2.3 to flow upwards of 300 cfm.
A regular 4 barrel manifold flows around 320 so you need that much to make a TPI
make good power.
01-06-2016, 01:45 AM
#66
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Re: TPI Combo - Low Dyno Results
Don, can a vortec base get there without welding or thin casting issues? Also can it be done with unported heads? Can you divulge how to measure properly/what we should be looking at? Even better a pic?
01-06-2016, 11:07 AM
#67
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Re: TPI Combo - Low Dyno Results
No way, it is a thin casting and is not much better than stock.
Using snap gauges, measure the head side opening 1"- 2" inside ...
width X height X .785 =sq.ins.
Using snap gauges, measure the head side opening 1"- 2" inside ...
width X height X .785 =sq.ins.
01-13-2016, 01:11 AM
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Re: TPI Combo - Low Dyno Results
Don, are there any gains to be had with the vortec base? Seems hard to get over 300whp in the real world with the vortec.
Is the only real way to big power a ported accel base, or a first with AFR's
Is the only real way to big power a ported accel base, or a first with AFR's
01-13-2016, 10:35 AM
#69
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Re: TPI Combo - Low Dyno Results
Out of the box that manifold isn't much better than stock.
The real gain comes from the heads.
After mine was welded and ported with E-tec heads I got 370 to the rear wheels.
The real gain comes from the heads.
After mine was welded and ported with E-tec heads I got 370 to the rear wheels.
01-14-2016, 01:12 AM
#70
Re: TPI Combo - Low Dyno Results
01-14-2016, 01:50 AM
#71
Re: TPI Combo - Low Dyno Results
No problem, I wish I could have had better news for you tho.
At best is is 1.7 sq. in. on the head side, it is 2.3 or better on the runner side. it needs to be around 2.3 to flow upwards of 300 cfm.
A regular 4 barrel manifold flows around 320 so you need that much to make a TPI
make good power.
At best is is 1.7 sq. in. on the head side, it is 2.3 or better on the runner side. it needs to be around 2.3 to flow upwards of 300 cfm.
A regular 4 barrel manifold flows around 320 so you need that much to make a TPI
make good power.
Don, am I reading this correctly? You ported the Voctec Base to 1.86 sq. in and it's 1.77 sq. in. stock?
02-19-2016, 12:06 PM
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Re: TPI Combo - Low Dyno Results
03-17-2016, 05:46 AM
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Re: TPI Combo - Low Dyno Results
So what ultimatly gave you the gains?
03-19-2016, 11:05 PM
#80
Re: TPI Combo - Low Dyno Results
If you look at the graph you'll notice that the Air/Fuel Ratio is not ideal. We couldn't get anymore fuel into the engine. I replaced the fuel filter and it may have been clogged as it had a lot of debris and rust particles. Hopefully there's some untapped HP to be had there... The next modifications will be to add a Power Steering Pump, Upgrade to 1 3/4 Headers, Swap over to an Aluminum Driveshaft & NOS!
03-20-2016, 10:31 AM
#81
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Re: TPI Combo - Low Dyno Results
Looking at the fuel curve I bet you have another 20 hp waiting for you.
03-25-2016, 11:09 PM
#85
03-29-2016, 07:21 AM
#86
Re: TPI Combo - Low Dyno Results
My biggest gripe has to be the total cost as it wasn't cheap.
03-29-2016, 08:46 AM
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Re: TPI Combo - Low Dyno Results
If you look at the graph you'll notice that the Air/Fuel Ratio is not ideal. We couldn't get anymore fuel into the engine. I replaced the fuel filter and it may have been clogged as it had a lot of debris and rust particles. Hopefully there's some untapped HP to be had there... The next modifications will be to add a Power Steering Pump, Upgrade to 1 3/4 Headers, Swap over to an Aluminum Driveshaft & NOS!
Does it run this lean when on the road? I ask because with my Camaro I think the ram air on the road would lean it out slightly so I would keep it a little rich on the dyno.
04-06-2016, 10:04 PM
#88
Re: TPI Combo - Low Dyno Results
less than ideal? I'd say you're very lean. I would start at 12-12.5 and lean it out from there. When you say you couldn't get anymore fuel into the engine what do you mean? Were the injectors at 100% and do you know what the fuel pressure was holding?
Does it run this lean when on the road? I ask because with my Camaro I think the ram air on the road would lean it out slightly so I would keep it a little rich on the dyno.
Does it run this lean when on the road? I ask because with my Camaro I think the ram air on the road would lean it out slightly so I would keep it a little rich on the dyno.
11-18-2016, 11:00 AM
#90
Re: TPI Combo - Low Dyno Results
I saw previously in the thread you might go NOS. I have a real nice dry kit for sale complete with remote bottle opener, vent tube, autometer pressure gauge, aluminium bottle mounts and purge kit. PM me if interested
11-19-2016, 07:56 AM
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Re: TPI Combo - Low Dyno Results
The ECM was not reading out so we tuned the car with the O2 Sensor from the Dynometer. Since we were not connected to the ECM we could not see if the injectors were static (100%). I did not have a fuel pressure gauge connected. The car hasn't been tuned for the street yet so it runs like crap...
PS Dyno Don, what headers do you have available? You can post or PM me. I am currently running Hooker shortys at 1 5/8 OD and believe I may benefit from larger OD and longer lengths. I'm concerned about road clearance with full length headers so a mid length would be great and the reason I haven't gone with that style. Also, I am running the exhaust back next to the trans so the drivers side kicking into the oil pan for the stock route isn't desired. Sorry for the hi-jack.
11-20-2016, 07:46 AM
#94
Re: TPI Combo - Low Dyno Results
You and the guy trying to sell me some NOS (Post #90)
03-11-2018, 05:14 PM
#96
Re: TPI Combo - Low Dyno Results
Dyno Day 2018 - March 24th
Really Hoping for 40+ HP/TQ
Power-Steering ✔
Aluminum Driveshaft needs a Transmission Yoke & 1 3/4" Headers need to be installed...
I'd like to do some wide-band tuning
prior to hitting the rollers too.
Really Hoping for 40+ HP/TQ
Power-Steering ✔
Aluminum Driveshaft needs a Transmission Yoke & 1 3/4" Headers need to be installed...
I'd like to do some wide-band tuning
prior to hitting the rollers too. 
03-19-2018, 11:30 AM
#98
Re: TPI Combo - Low Dyno Results
Bought a Summit Racing Aluminum Driveshaft (Made by Sonnax). No time to send the Original (RPO Code JG1) out for service.
Aluminum Driveshaft ✔
Thank-You to Kevin91Z for the Street Tune on Sat.
Splurging on 110 Octane & GP1 Package from Moates for a “110 Octane Track Chip”.
Aluminum Driveshaft ✔
Thank-You to Kevin91Z for the Street Tune on Sat.
Splurging on 110 Octane & GP1 Package from Moates for a “110 Octane Track Chip”.
