Ported 87mm vs Katech 103
#1
Ported 87mm vs Katech 103
I’ve read about everything I can find and wanted to see if anyone had any insight. Mods would include 18% U/D pulley, CAI and ported blower/snout. Is the 103mm that much more gain over a ported 87mm? I just haven’t seen flow number comparing both.
One more question. What would the gain be just porting the snout and not the blower?
Thanks again guys for your insight.
One more question. What would the gain be just porting the snout and not the blower?
Thanks again guys for your insight.
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06-06-2018, 05:03 PM
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the problem with this catch and release lake is there's only one fish and he always bites.
guess he just loves a worm in his mouth.
guess he just loves a worm in his mouth.
#2
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a ported throttle body doesn't really do anything, i have had probably 6 of them on three corvettes and a couple trucks, etc. any result is either placebo or margin of error.
porting the snout will give you 85-90% of the gains of porting the whole blower. IMO, don't invest money in the 1.7. put it towards a 2.6 or 2.9 (don't waste your money on the 2.3, it's no better than a modded 1.7).
porting the snout will give you 85-90% of the gains of porting the whole blower. IMO, don't invest money in the 1.7. put it towards a 2.6 or 2.9 (don't waste your money on the 2.3, it's no better than a modded 1.7).
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#3
Higgs nailed it. The shop I took mine too (specializing in vette's and know their stuff) said the same thing....don't bother with ported TB. You may get better throttle response but no appreciable dyno gains with that alone. The 1.7 is sufficient if you're looking to stay under 700whp. Beyond that, the 2.9 looks pretty amazing and will be on my to-do list I think.
#4
Team Owner
a ported throttle body doesn't really do anything, i have had probably 6 of them on three corvettes and a couple trucks, etc. any result is either placebo or margin of error.
porting the snout will give you 85-90% of the gains of porting the whole blower. IMO, don't invest money in the 1.7. put it towards a 2.6 or 2.9 (don't waste your money on the 2.3, it's no better than a modded 1.7).
porting the snout will give you 85-90% of the gains of porting the whole blower. IMO, don't invest money in the 1.7. put it towards a 2.6 or 2.9 (don't waste your money on the 2.3, it's no better than a modded 1.7).
The PTB is needed on the lt4 and adds to the drivability adds power
in the midrange. Help correct the off idle bog the M7 is famous for.
Adds smoother air flow and CFM has to add power.
Too many People have PTB's with great results. They are laughing at this post! Like 1000's
Then check this out and many other threads on the 2300
https://www.corvetteforum.com/forums...mbination.html
https://www.corvetteforum.com/forums...lts-video.html The 2.3 blows the weak 1.7 away!
Here is the 2300 on pump gas can not do this with any 1.7 with no meth or band aids. The 1.7 is over ready over speed dyno shows a push then dies no top end!
2300 vs 1.7 The 1.7 is dead at 6300 talk about weak look at the TQ going down hill this unit had a Halltech intake as well The 2.300 is off the charts! The 2300 can do ZR1 power with the lt4 on pump gas! Thanks for the laughs! Higgs!
Last edited by 3 Z06ZR1; 06-06-2018 at 04:43 PM.
#5
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the problem with this catch and release lake is there's only one fish and he always bites.
guess he just loves a worm in his mouth.
guess he just loves a worm in his mouth.
#6
Drifting
#7
Racer
a ported throttle body doesn't really do anything, i have had probably 6 of them on three corvettes and a couple trucks, etc. any result is either placebo or margin of error.
porting the snout will give you 85-90% of the gains of porting the whole blower. IMO, don't invest money in the 1.7. put it towards a 2.6 or 2.9 (don't waste your money on the 2.3, it's no better than a modded 1.7).
porting the snout will give you 85-90% of the gains of porting the whole blower. IMO, don't invest money in the 1.7. put it towards a 2.6 or 2.9 (don't waste your money on the 2.3, it's no better than a modded 1.7).
#8
Drifting
3Z your TQ starts dropping off at 3700 RPMs and you don't peak your HP till almost 5700. Plus your phots are impossible to read. Keep the data looking fuzzy it is easy to say whatever you want. I did 45 HP less and as much TQ as you on pump with just pulley swaps. Spent lost less on the two pulleys than the $5K on a blower. I would guess the difference in price was about $50/HP. Only you can decided it that it is worth it.
Last edited by AZGASSER; 06-06-2018 at 05:48 PM.
#9
Le Mans Master
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Between you and Higgs, one of you has a really solid track record of accurate and well-thought-out posts, and the other does not.
Aren't you the guy, who along with other various frenetic arm-waving, insisted that the A8 doesn't have rev-matching on downshifts?
I'll go with Higgs, thankyou.
Aren't you the guy, who along with other various frenetic arm-waving, insisted that the A8 doesn't have rev-matching on downshifts?
I'll go with Higgs, thankyou.
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JHEBERT (06-06-2018)
#10
Drifting
Not to be argumentative, but why would you have had 6 ported TB's on 5+ different cars if the result is basically a zero net gain? Seems like after one you might be under the placebo effect, but after 2 and no gains it seems like you'd be done with them. What was the thinking?
Last edited by AZGASSER; 06-06-2018 at 05:53 PM.
#11
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Not to be argumentative, but why would you have had 6 ported TB's on 5+ different cars if the result is basically a zero net gain? Seems like after one you might be under the placebo effect, but after 2 and no gains it seems like you'd be done with them. What was the thinking?
#12
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There may be other "gains" than just HP. Like most of the M7 guys report, better "tip in"/throttle response. Doesn't mean more HP just better drivability. I can speak from experience that I have fallen prey to the mob mentality or FOMO. If someone does it and likes it, I have too as well. In the end I am sure I have spent $$$$ on my Vettes and have not had any real gains. This also includes car care products as well as audio upgrades. Only losses in my bank account, which I am ok with. Just being honest about this.
#14
Racer
There may be other "gains" than just HP. Like most of the M7 guys report, better "tip in"/throttle response. Doesn't mean more HP just better drivability. I can speak from experience that I have fallen prey to the mob mentality or FOMO. If someone does it and likes it, I have too as well. In the end I am sure I have spent $$$$ on my Vettes and have not had any real gains. This also includes car care products as well as audio upgrades. Only losses in my bank account, which I am ok with. Just being honest about this.
#15
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The real cause for the bog is in the tune. I understand some people don’t want to tune for warranty reasons and you are really not left with many options to improve the car at that point. There are plenty of reports that say the TB didn’t help the bog as well.....I suppose it’s all in the foot of the beholder. Either way, one should persue their own happiness.
#16
Racer
The real cause for the bog is in the tune. I understand some people don’t want to tune for warranty reasons and you are really not left with many options to improve the car at that point. There are plenty of reports that say the TB didn’t help the bog as well.....I suppose it’s all in the foot of the beholder. Either way, one should persue their own happiness.
Last edited by MacRoadie; 06-07-2018 at 12:50 PM.
#17
And I mentioned the same thing in a couple ported t body threads, but there was just too much money being made in the thread for anyone to listen
John
John
#18
Wow the expert has spoken! Wrong and wrong!
The PTB is needed on the lt4 and adds to the drivability adds power
in the midrange. Help correct the off idle bog the M7 is famous for.
Adds smoother air flow and CFM has to add power.
Too many People have PTB's with great results. They are laughing at this post! Like 1000's
Then check this out and many other threads on the 2300
https://www.corvetteforum.com/forums...mbination.html
https://www.corvetteforum.com/forums...lts-video.html The 2.3 blows the weak 1.7 away!
Here is the 2300 on pump gas can not do this with any 1.7 with no meth or band aids. The 1.7 is over ready over speed dyno shows a push then dies no top end!
2300 vs 1.7 The 1.7 is dead at 6300 talk about weak look at the TQ going down hill this unit had a Halltech intake as well The 2.300 is off the charts! The 2300 can do ZR1 power with the lt4 on pump gas! Thanks for the laughs! Higgs!
The PTB is needed on the lt4 and adds to the drivability adds power
in the midrange. Help correct the off idle bog the M7 is famous for.
Adds smoother air flow and CFM has to add power.
Too many People have PTB's with great results. They are laughing at this post! Like 1000's
Then check this out and many other threads on the 2300
https://www.corvetteforum.com/forums...mbination.html
https://www.corvetteforum.com/forums...lts-video.html The 2.3 blows the weak 1.7 away!
Here is the 2300 on pump gas can not do this with any 1.7 with no meth or band aids. The 1.7 is over ready over speed dyno shows a push then dies no top end!
2300 vs 1.7 The 1.7 is dead at 6300 talk about weak look at the TQ going down hill this unit had a Halltech intake as well The 2.300 is off the charts! The 2300 can do ZR1 power with the lt4 on pump gas! Thanks for the laughs! Higgs!
#19
Pro
Ok, I'll throw a little gas on the fire....
Recently switched from a ported stock TB to a 103mm on a modified engine with a stock ported blower & snout. (blower was ported before 103 but, the snout was ported to fit the 103.)
The car has been dynoed on the same dyno each time something changes.
The total gains? …. wait for it!
A bump of 3.8 hp & 8lb-ft torque to the wheels.
To be fair it was about 35 degrees warmer and way more humid but I would say that's within the margin or error.
Recently switched from a ported stock TB to a 103mm on a modified engine with a stock ported blower & snout. (blower was ported before 103 but, the snout was ported to fit the 103.)
The car has been dynoed on the same dyno each time something changes.
The total gains? …. wait for it!
A bump of 3.8 hp & 8lb-ft torque to the wheels.
To be fair it was about 35 degrees warmer and way more humid but I would say that's within the margin or error.
#20
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Ok, I'll throw a little gas on the fire....
Recently switched from a ported stock TB to a 103mm on a modified engine with a stock ported blower & snout. (blower was ported before 103 but, the snout was ported to fit the 103.)
The car has been dynoed on the same dyno each time something changes.
The total gains? …. wait for it!
A bump of 3.8 hp & 8lb-ft torque to the wheels.
To be fair it was about 35 degrees warmer and way more humid but I would say that's within the margin or error.
Recently switched from a ported stock TB to a 103mm on a modified engine with a stock ported blower & snout. (blower was ported before 103 but, the snout was ported to fit the 103.)
The car has been dynoed on the same dyno each time something changes.
The total gains? …. wait for it!
A bump of 3.8 hp & 8lb-ft torque to the wheels.
To be fair it was about 35 degrees warmer and way more humid but I would say that's within the margin or error.
Second, what was the power difference you dyno'd going from stock to ported TB? You said you dyno'd on the same dyno with each change.