TBIThrottle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.
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if your going to swap your intake you might as well switch to TPI. WAY better than TBI for performance. Im sure you could get a complete TPI set up for realy cheap.
Painless wiring makes an adapter plate for using a regular bore holley manifold with your factory throttle body so that could open up some options for you.
Now for some TBI specific tech.......TPI is NOT light years better than TBI. In fact it's cheaper to make power with TBI than with TPI. In stock form you can make the same if not a few more HP up top with TBI and only give up about 15-20 ft/lb of torque in a very narrow power band down low.
The "best" intake and TB setup simply depends on what you are doing with the car. Most likely you have a street car and just want to make more power. The performer RPM has proven itself as one of the best all around intakes for carb applications and will work great with your TBI and adapter plate. Only problem is that's it darn hard to get it to fit under the stock hood. After the RPM it's a toss up between the regular performer and a low rise single plane like weiand makes.
The only upgrade over your stock TB is the big block version, holley also sells a version commonly refered to as the (670 cfm) version. Both have 2" throttle bores, but the GM version usually has much bigger injectors (around 80 lb/hr). Keep in mind that changing the TB or injectors will most likely require you to retune the ECM to account for the changes. TBI or any speed density styel fuel injection system requires retuning for any modifications that move more air.
Now for some TBI specific tech.......TPI is NOT light years better than TBI. In fact it's cheaper to make power with TBI than with TPI. In stock form you can make the same if not a few more HP up top with TBI and only give up about 15-20 ft/lb of torque in a very narrow power band down low.
a friend and i were just dicusing how to inprove his tbi suburbun my thoughts were 87+carbed intake w egr, a tbi adaptor, 454 stock tb, cold air intake , and 1.6 rockers but thats in a very heavy truck, and later full exaust and maybe a blower for show and go.
Now for some TBI specific tech.......TPI is NOT light years better than TBI. In fact it's cheaper to make power with TBI than with TPI. In stock form you can make the same if not a few more HP up top with TBI and only give up about 15-20 ft/lb of torque in a very narrow power band down low.
The "best" intake and TB setup simply depends on what you are doing with the car. Most likely you have a street car and just want to make more power. The performer RPM has proven itself as one of the best all around intakes for carb applications and will work great with your TBI and adapter plate. Only problem is that's it darn hard to get it to fit under the stock hood. After the RPM it's a toss up between the regular performer and a low rise single plane like weiand makes.
The only upgrade over your stock TB is the big block version, holley also sells a version commonly refered to as the (670 cfm) version. Both have 2" throttle bores, but the GM version usually has much bigger injectors (around 80 lb/hr). Keep in mind that changing the TB or injectors will most likely require you to retune the ECM to account for the changes. TBI or any speed density styel fuel injection system requires retuning for any modifications that move more air.
i love it!! thanks for the ideas. im gonna shop around some more but i will keep that in mind!
Hey Kev, I don't come into every TPI circle jerk over on your board with a smart a$$ comment.....so don't come in here with your attitude.
In other words.....add some tech or get out.
I did, in post #5 I recommended an intake and throttle body for him.
But then you posted something I felt was way off-base. Other than Fast355's factory freaks, I've never seen a TBI make as much power as a TPI at the wheels, and I've seen them give up a lot more than 20 lb/ft, across the power band, not just down low. But I'll leave you to your circle jerk, as you call it.
TBI does great for what it was designed, as a good MPG cruiser and daily driver. And TPI does great for what it was designed, a low RPM torque monster.
My 1991 Z28 stock with 3" exhaust: 195 RWHP, 265 RWTQ
My 1992 RS stock with 3" exhaust: 158 RWHP, 220 RWTQ
I did, in post #5 I recommended an intake and throttle body for him.
But then you posted something I felt was way off-base. Other than Fast355's factory freaks, I've never seen a TBI make as much power as a TPI at the wheels, and I've seen them give up a lot more than 20 lb/ft, across the power band, not just down low. But I'll leave you to your circle jerk, as you call it.
TBI does great for what it was designed, as a good MPG cruiser and daily driver. And TPI does great for what it was designed, a low RPM torque monster.
My 1991 Z28 stock with 3" exhaust: 195 RWHP, 265 RWTQ
My 1992 RS stock with 3" exhaust: 158 RWHP, 220 RWTQ
Once again we don't get all the information. Surprise, surprise, MR. TPI left something out. Grab a timing light, lol. All it takes is a quick look in the calibrations to see that the TPI has MUCH more timing down low and the TBI got the short-end of the stick. I have gained 30-50 RWTQ by TUNING STOCK TBI engines for what they need. This is a video of a stockish 5.0 TBI (tuned, stock roller cam, 1.6:1 rockers, stock 187 heads, stock TBI setup, open element, 3" single exhaust, high flow cat, magnaflow muffler) moving around 5,000 lbs of 1994 G10 Van. It does better than you would think. Did 177 RWHP @ 3,800 and 261 RWTQ BONE STOCK on the STOCK Conservative TBI Van tune.
Kevin, when I said "stock form" I'm talking about the induction system.....NOT THE WHOLE MOTOR. LO3's are junk they had the crappy heads and tiny cams along with restrictive exhaust. When I say TBI I'm talking about throttle body injection, not the boat anchors they were attached to.
Take a bone stock TPI system and TBI system and you can make the same if not more peak hp with TBI on a particular engine and only give up a bit of torque in a narrow power band. It's been proven.
