, so the fast 90/90 is the next mod on my list to achieve 400hp. 
What mods warrant a FAST LSX intake?
good question, I was going to add the fast 90/90 with the H/C last month. But, the guys at MTI reccomend that i dont, because you loose low end torque with the stock displacement motor (or something like that). So i just saved myself a grand and bought a billet MTI TB 
Can't believe MTI would tell you you'd lose low end. That's entirely false. Here's my dyno showing gains going from an LS6 intake/ported TB to a FAST 90mm intake (ported by Tony Mamo) and a Nick Williams 90mm TB. Keep in mind, my gains would have been even larger if I hadn't been running a small 215 cam and stock manifolds and cats.
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Originally Posted by red6speedss
those are some awsome good gains from just an intake. Does the 90/90 always dyno close to 30hp.
So a FAST 90/90 combo will work well on a relatively stock engine.
I guess I have to get rid of the old school thought that this would be like a carb that was too large, and flow more air than the stock motor could use, with the result being poor throttle response down low
I guess I have to get rid of the old school thought that this would be like a carb that was too large, and flow more air than the stock motor could use, with the result being poor throttle response down low
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Originally Posted by VerySlowWS6
good question, I was going to add the fast 90/90 with the H/C last month. But, the guys at MTI reccomend that i dont, because you loose low end torque with the stock displacement motor (or something like that). So i just saved myself a grand and bought a billet MTI TB
My torque numbers are fine.
Originally Posted by 2K2WS6TA
How much tuning (if any) was needed, does it have stock injectors, maf, any other mods aside from the 90/90
I was told this was because '98 PCMs had no provisions for a 90 mm throttle body, plus, 90 mms are hard to tune anyway unless you get the LS2 stock throttle body that has a slight venturi in it to help with this.
Originally Posted by transam1998
All my mods are in the sig. I do have some idle issues, I either have to live with it idling high while I am rolling, or turn down the idle stop, but then it has to hunt for idle a bit when started cold. I can live with this.
I was told this was because '98 PCMs had no provisions for a 90 mm throttle body, plus, 90 mms are hard to tune anyway unless you get the LS2 stock throttle body that has a slight venturi in it to help with this.
I was told this was because '98 PCMs had no provisions for a 90 mm throttle body, plus, 90 mms are hard to tune anyway unless you get the LS2 stock throttle body that has a slight venturi in it to help with this.
Originally Posted by Patrick G
Your idle issues are totally fixable with a good tune. 90mm throttle bodies are not hard to tune if you get the right one. The Nick Williams throttle bodies require very little in the way of tuning and will work just fine on a '98 C-5 or F-body.
Right in my sig, it says I have a Nick Williams throttle body... and it's not lying
Originally Posted by Patrick G
Can't believe MTI would tell you you'd lose low end. That's entirely false. Here's my dyno showing gains going from an LS6 intake/ported TB to a FAST 90mm intake (ported by Tony Mamo) and a Nick Williams 90mm TB. Keep in mind, my gains would have been even larger if I hadn't been running a small 215 cam and stock manifolds and car.
I had been looking and research on the forum, and for the most part people were happy with the FAST 90/90. So i figured it would be worth adding along with the H/C package. There must have been some very good reason they recommended that i dont add the 90/90, it would have been more money for them
Originally Posted by transam1998
Right in my sig, it says I have a Nick Williams throttle body... and it's not lying
Originally Posted by Patrick G
Sorry, missed that. Well then, you're in luck. Your idle problems are totally tunable. You most likely need to address the IAC Effective Area portion of the tune. Do you have tuning software? If so, what type?
No, I've been having EPP tune the car for me. I should probably buy the software myself and take care of it.
I may try Dynotech as well, I've heard that they will spend entire days tuning on your car until it is right. I like the guys at EPP, but they jump through the tuning within an hour and maybe 3 pulls, then they are done. The guys at EPP are great and have treated me well, and I intend to have more work done at their shop, but I'm not sure if I am getting the most from this or not.
Just a note, I met a friend at my track, he has an '04 Z06 with all the same mods I have, making 2 more rwhp and 4 less ftlb of torque. He had a Nick Williams throttle body that behaved the same as mine. Dynotech worked on tuning it for days, thought they had it, but it cropped up again after he got his car home. The owner of Dynotech actually drove to this guys house out of state with a laptop and tried tuning this out. In the end, they figured he had a bad throttle body and installed an LS2 throttle body. He hasn't had a problem with this since.
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When i install the fast 90/90 (intake+tb) on my 2001z M6 in future do I need an immediate tune ? will the car work fine with a stock ci and a stock cam + stock tune?
Thats a good question Prostock_bigblock, as I have a 90/90 combo heading to my door in the next few days....an answer to this may hold off my installation till I can figure out a tune....
Also, will I need anything else to make this swap? I have a 2001 Ws6, so I'm pretty sure I don't need any new parts, just take the old one off, put the new one on. Also, does the 2001+ LS1's have the LS6 valley cover? If not, i'll replace that while I'm at it....
Also, sorry if I high-jacked your thread.
Also, sorry if I high-jacked your thread.