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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?
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).
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.
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).
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
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!
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).
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?
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.
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?
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?
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 $$$$ on my Vettes and have not had any real gains. This also includes car care products as well as audio upgrades. Only losses in my bank account, which I am ok with. Just being honest about this.
Not to be argumentative, but why would you have had 6 ported TB's on 5+ different cars if the result is basically a zero net gain? Seems like after one you might be under the placebo effect, but after 2 and no gains it seems like you'd be done with them. What was the thinking?
that's a great question. the first 2 or 3 cars you do because you don't know, people put up good reviews, etc and everyone is subject to placebo in some fashion.... then you start thinking, I am not sure if this does anything, but since it's the cheapest thing you can do and it might at least do "some"thing then I will just do it anyways....eventually you actually test and compare and figure out you are within the margin of error for a dyno or airflow test. when you trade cars a couple times per year and have multiple cars, it's easy to find you have throttle bodies coming and going.
There may be other "gains" than just HP. Like most of the M7 guys report, better "tip in"/throttle response. Doesn't mean more HP just better drivability. I can speak from experience that I have fallen prey to the mob mentality or FOMO. If someone does it and likes it, I have too as well. In the end I am sure I have spent $$$$ on my Vettes and have not had any real gains. This also includes car care products as well as audio upgrades. Only losses in my bank account, which I am ok with. Just being honest about this.
There may be other "gains" than just HP. Like most of the M7 guys report, better "tip in"/throttle response. Doesn't mean more HP just better drivability. I can speak from experience that I have fallen prey to the mob mentality or FOMO. If someone does it and likes it, I have too as well. In the end I am sure I have spent $$$$ 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.
I had the Mamo PTB installed for that very reason. After installation, the tip in bog was dramatically lessened. The M7's are notorious for it. Before I had mine installed, I had the car in to have the driver seat switch panel replaced and the service adviser at dealership actually stalled the car in the service drive. His comment was "I haven't done that in several weeks". Not the fist time ever, the first time in a couple of weeks.
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.
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.
I agree the tip-in bog decidedly went away when the car was tuned. Torque management was adjusted, as were a few other things. Nothing bolt on will beat a properly tuned car.
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
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!
Can you please ask for your run file so you can see the dyno graph clearly.
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.
First, 35 degrees hotter and way more humid can EASILY be 30-40 HP. So technically you gained 30-40 HP with the 103 with the 3.8 and 8 being within the margin of error. Don't discount air quality, it means everything. I won't even go to the track when its hot or humid, there is no point. Density altitude is very important.
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.
06-05-2018, 11:15 PM
Ported 87mm vs Katech 103
