Small Turbos?

[dabocx]

Wouldn't go below at gtx28 if you want something smaller id just do a S/C

[Sportsguy83]

AVO's 55 Trim is not bad at all

[BlueDubbinTDI]

Yeah the AVO stage 1 looks really nice. Thats what I've been lookin at for a couple months now.

[coyote]

12.5:1 compression helps a lot, but we are still testing a gtx2863r next week.

The numbers won't make for good internet bragging, but this one will be about driving.


Sent from my Nexus 4 using Tapatalk 2

[cf6mech]

Originally Posted by icemang17

its not surprising that the early turbo kits employ large turbos.....which make the classic 45' increasing torque curve once the boost hits fairly high in the rpm.....just like classic Supras that made silly HP..... When torque and HP both spike quickly in upper midrange will make the car VERY lousy on the street......

Smaller turbos that spool quickly (or twin screw superchargers) offer near instant boost across the entire power band....BUT at the price of peak power.....but for a street car a smaller turbo that can achieve full boost from say 2000rpm up is much better than one that is worse than stock below 4k..... race cars are different of course.... My opinion as a racer.....I would rather have a 200hp-200ftlb engine that has a wide flat torque band (like our cars do stock) than a 250hp-150ftlb engine that has it all up high.....why? getting off the corners.....high torque engines always win the beginning of the drag race off the corner....then high RPM or high boost engines eventually might catch up if the straight is long enough, but have to take risks in the braking zone (easy to block) to make a pass..... plus mini straights inbetween corners always favor higher torque

Tend to agree with you but explain a Formula 1 car with 700 hp and 200ftlbs of torque?...yah there light,...but not 200ftlbs light. They seem to get off the corners quite briskly.

[coyote]

Originally Posted by cf6mech

Tend to agree with you but explain a Formula 1 car with 700 hp and 200ftlbs of torque?...yah there light,...but not 200ftlbs light. They seem to get off the corners quite briskly.

15,000rpm

[cf6mech]

actually I thought higher than that,...but torque isn't the do all end all,....to me its corner speed.

[GTB/ZR-1]

lol F1 cars idle @ 4-5k and are rarely under 10k on the track--they spin the crap outta them.

[SamS]

Originally Posted by sw20kosh

Looks like the greddy kit's turbo is relatively small right?

With a redline of 7400 or more, you wouldn't want something too small. What is the redline on that miata?

I believe fuel cut was 7200, but I'd usually shift by 6500. It was just a street car.

Originally Posted by icemang17

its not surprising that the early turbo kits employ large turbos.....which make the classic 45' increasing torque curve once the boost hits fairly high in the rpm.....just like classic Supras that made silly HP..... When torque and HP both spike quickly in upper midrange will make the car VERY lousy on the street......

Smaller turbos that spool quickly (or twin screw superchargers) offer near instant boost across the entire power band....BUT at the price of peak power.....but for a street car a smaller turbo that can achieve full boost from say 2000rpm up is much better than one that is worse than stock below 4k..... race cars are different of course.... My opinion as a racer.....I would rather have a 200hp-200ftlb engine that has a wide flat torque band (like our cars do stock) than a 250hp-150ftlb engine that has it all up high.....why? getting off the corners.....high torque engines always win the beginning of the drag race off the corner....then high RPM or high boost engines eventually might catch up if the straight is long enough, but have to take risks in the braking zone (easy to block) to make a pass..... plus mini straights inbetween corners always favor higher torque

These are the characteristics I'd be looking for. I'd rather have instant midrange torque for passing or leaving a corner without wringing the car out or downshifting, basically the feel of a larger engine but with better fuel economy.

Maybe the twin screw is more what I'm looking for, but I don't want to sacrifice cruising mpg since I commute mostly freeway. I think I did see something about de-clutching the SC during low loads though...

[FRSRAVEN]

The Innovate unit has an internal by-pass which cuts boost and reduces load on the supercharger when cruising.

The Greddy kit uses a turbo that is good for approximately 420hp. This puts it in line with the size of the AVO turbo, or the 50 trim offering from FA20Club. A GT2871R is also around the same size.

Because of the flow of this engine, all of the above turbos should offer good spool characteristics. Personally, I'm just about to pull the trigger on the FA20Club kit. The only thing stopping me is the Innovate kit, I like the look of it, the OEM fit and finish, etc. But I'm looking for around 270whp on pump, and that would be pushing the Innovate kit.

[diss7]

Originally Posted by coyote

12.5:1 compression helps a lot, but we are still testing a gtx2863r next week.

The numbers won't make for good internet bragging, but this one will be about driving.


Sent from my Nexus 4 using Tapatalk 2

Any update on this??

[diss7]

Originally Posted by FRSRAVEN

The Greddy kit uses a turbo that is good for approximately 420hp. This puts it in line with the size of the AVO turbo, or the 50 trim offering from FA20Club. A GT2871R is also around the same size.

A t518z 10cm will not provide 420hp.

Unless you are talking about crank hp, ethanol/race gass, or both.

Those three turbos will be pushing to get to 350whp, on pump gas.

Have owned a t518z 8cm (which the AVo is a copy of) and a 2871R, ran both at limit. Feel somewhat confident in my statement.

However, run one of those turbos on motor with headwork, and on e50, and you start getting ALOT more power. Heres a mates sr20 that was recently dyno'd. 2871R, 20psi, E50. Pushed to its limit.

[mike the snake]

A few years ago F1 engines were spinning to 23-24000 rpm! Now they are limited to 18000, and I thought I heard someone say they idled around 8000.

That's all out the window next year where they're changing to turbo V-6 engines that undoubtedly will rev much slower.

Originally Posted by GTB/ZR-1

lol F1 cars idle @ 4-5k and are rarely under 10k on the track--they spin the crap outta them.

[Sellout]

Originally Posted by mike the snake

A few years ago F1 engines were spinning to 23-24000 rpm! Now they are limited to 18000, and I thought I heard someone say they idled around 8000.

That's all out the window next year where they're changing to turbo V-6 engines that undoubtedly will rev much slower.

Rules limit idle speed to under 5k.