Katech LT5 throttle body and adapter

Stephen12ZL1 · 05-11-2021, 08:54 PM

I wanted to try something which has been mentioned but not sure if it has any merit...LT5 ported throttle body with adapter. No tune which I know may be a problem but just wanted to see how it goes. It is a perfect bolt on with the required adapter plate which necks down from 95mm-87mm. Wiring is an exact plug in with nothing required.

I drove it for about 10 miles and noticed nothing unusual. No CEL or any hesitation. If anything, it idles slightly smoother. Not sure if the throttle body electric motor has been idealized...LT4 seems totally happy with the swap. I did a few brief WOT pulls and really can't tell anything negative.

Is this useless, a waste of money, etc., etc...? I didn't log or check any data. Pic below.

*radz28* · 05-13-2021, 09:08 AM

It's probably hard to quantify without either a dyno or scanner.

There are some reports of these TBs throwing the calibration off a lot. If you care about (or even have) cats', this might be something worth monitoring. It's my understanding that if you're running low ignition timing, it can wipe cats' out. I have seen the addition of this TB throw idle torque off and just make things really wonky. It could effect idle airflow, too, which can result in wonky'ness, and have timing and TM issues, too. I've seen a smooth idle, but really low timing because of TM, so without seeing the data from a scanner, everything seems okay, even though it probably isn't.

On a stock car, you might see a dip in torque/power from the throttle closing because any number of tune tables could be off. I've seen the throttle close on the street because some of these table are thrown off. It felt completely fine sometimes, and other times, I could feel I wasn't getting the throttle blade open completely (verified by my scanner, BTW). I log almost everytime I drive, so it's easy to see. My point is, that even stock cars will limit the throttle it seems, so changing airflow, which changes torque, might exacerbate throttle closing, among introducing a number of other issues (like TM kicking in more aggressively).

It might take a couple drives for problems to arise. It might also be totally fine, too. My point is to think about getting a scanner too, or something like HPTuners, and really get some good data. That might be the best thing you could do.

JMO.

Z OH 6 · 05-13-2021, 10:26 AM

I don't think it will hurt anything but I can't really see any benefit if the supercharger snout isn't port matched to 95mm.

Stephen12ZL1 · 05-13-2021, 06:20 PM

good info...I will log HP tuners soon but just for a few quick trips it seems fine so far.

*radz28* · 05-14-2021, 07:56 AM

Quote:

Originally Posted by Stephen12ZL1

good info...I will log HP tuners soon but just for a few quick trips it seems fine so far.

It definitely wouldn't hurt

DigitalSyn · 05-14-2021, 08:20 AM

I just ordered the 87MM Katech TB yesterday and saw this bigger one and thought about getting it instead, but chickened out. They do mention it won't fit the stock housing ( which you've got the adapter ) and the engine would need a tune to take advantage. Count me in for updates, I am curious what you see!

Timbo-1LE · 05-14-2021, 01:28 PM

Did you call Katech support? Im sure they can assist.

05-11-2021, 08:54 PM	#1
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,808	Katech LT5 throttle body and adapter I wanted to try something which has been mentioned but not sure if it has any merit...LT5 ported throttle body with adapter. No tune which I know may be a problem but just wanted to see how it goes. It is a perfect bolt on with the required adapter plate which necks down from 95mm-87mm. Wiring is an exact plug in with nothing required. I drove it for about 10 miles and noticed nothing unusual. No CEL or any hesitation. If anything, it idles slightly smoother. Not sure if the throttle body electric motor has been idealized...LT4 seems totally happy with the swap. I did a few brief WOT pulls and really can't tell anything negative. Is this useless, a waste of money, etc., etc...? I didn't log or check any data. Pic below. Attached Images __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

05-13-2021, 09:08 AM	#2
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,201 View My Garage	It's probably hard to quantify without either a dyno or scanner. There are some reports of these TBs throwing the calibration off a lot. If you care about (or even have) cats', this might be something worth monitoring. It's my understanding that if you're running low ignition timing, it can wipe cats' out. I have seen the addition of this TB throw idle torque off and just make things really wonky. It could effect idle airflow, too, which can result in wonky'ness, and have timing and TM issues, too. I've seen a smooth idle, but really low timing because of TM, so without seeing the data from a scanner, everything seems okay, even though it probably isn't. On a stock car, you might see a dip in torque/power from the throttle closing because any number of tune tables could be off. I've seen the throttle close on the street because some of these table are thrown off. It felt completely fine sometimes, and other times, I could feel I wasn't getting the throttle blade open completely (verified by my scanner, BTW). I log almost everytime I drive, so it's easy to see. My point is, that even stock cars will limit the throttle it seems, so changing airflow, which changes torque, might exacerbate throttle closing, among introducing a number of other issues (like TM kicking in more aggressively). It might take a couple drives for problems to arise. It might also be totally fine, too. My point is to think about getting a scanner too, or something like HPTuners, and really get some good data. That might be the best thing you could do. JMO. __________________ '20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs

05-13-2021, 06:20 PM	#4
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,808	good info...I will log HP tuners soon but just for a few quick trips it seems fine so far. __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

05-13-2021, 10:26 AM	#3
Z OH 6 Drives: 2021 Red Hot ZL1 Join Date: Sep 2020 Location: Gapplebees Posts: 3,092	I don't think it will hurt anything but I can't really see any benefit if the supercharger snout isn't port matched to 95mm.

05-14-2021, 08:20 AM	#6
DigitalSyn Drives: 2019 ZL1 1LE - Satin Steel Grey Join Date: May 2021 Location: Cumming, GA Posts: 15	I just ordered the 87MM Katech TB yesterday and saw this bigger one and thought about getting it instead, but chickened out. They do mention it won't fit the stock housing ( which you've got the adapter ) and the engine would need a tune to take advantage. Count me in for updates, I am curious what you see!

05-14-2021, 01:28 PM	#7
Timbo-1LE Drives: 2017 SS 1LE Join Date: Mar 2017 Location: Florida Posts: 617	Did you call Katech support? Im sure they can assist.

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