Turbo 4.0 Cherokee
Thread Starter
Newbie
Joined: Nov 2017
Posts: 15
Likes: 6
From: Long Island, NY
Year: 1997
Model: Cherokee (XJ)
Engine: 4.0 Turbo
CF Veteran
Joined: Dec 2011
Posts: 1,777
Likes: 22
From: PA KOTUFU!
Year: 1998
Engine: 4.0L 162,000
For as impressive as your peak numbers are, it seems a bit soft below 4000 rpm.
You boost curve must really ramp up. Probably a bit too big turbocharger. It would be interesting to see your boost curve also on chart.
Having said that, you have the 3rd highest power Jeep I6 engine. I have been collecting dyno numbers for a long time.
Even with Dynojet reading 10% high, you still rank right up there. I have to add you to my list.
311rwhp/342rwtq corrected* (345rwhp/375rwtq Dynojet) 4.0L TURBO 0.030" stock pistons, stock rods, stock head, stock springs, stock manifold and stock TB, Comp 232 cam, Megasquirt MS3x, walbro 255lph, Borg Warner S300 63mm T4 .88A/R turbo, 39mm WG, 14psi boost, air-air IC, E85, 14psi boost, GM 400 auto trans, 4x4, 242, dana 30/44
JEEP DYNO-
230rwhp/257rwtq estimate (325hp/363tq engine dyno) 4.9L Stroker ported BV head 470 carb stock Clifford intake Newcomer Racing
237rwhp/317rwtq ?dyno '01 TJ 4.0L +Borla Headers and Magnum Powers Supercharger intercooled 8psi
243rwhp/360rwtq Mustang dyno '01 TJ 5speed 5.0L Built Stroker+Magnum Powers M90 SC 7.9"/2.75"= 13,932 SC rpm 6psi (N/A 208hp/280tq)
256rwhp/268rwtq estimate (361hp@5400/377tq@4800 engine dyno) 4.9L Stroker ported BV head bigger carb intake + headers
256rwhp/313rwtq corrected*(285rwhp/348rwtq Dynojet) 2WD 5sp 4.6L Stroker Vortech SC 5-7psi non-intercooler 42lb/hr injecors ECU tuned by FlyinRyan
263rwhp/353rwtq ?Dyno 4.6L Stroker Turbo 8.0:1 cam 10psi 'YJ + Corey'
268rwhp/375rwtq Mustang dyno '01 TJ 5speed 5.0L Built Stroker + M90 SC Magnum Powers 7.9"/2.75"= 13,932 SC rpm 7psi (N/A 208hp/280tq)
274rwhp/322rwtq ?Dyno 4.0L Turbo MS 36lb 50mm T3/T4 12psi 'Pseudosport Racecar'
307rwhp/402rwtq Mustang dyno '01 TJ 5speed 5.0L Built Stroker + M90 SC Magnum Powers 7.9"/2.75"= 13,932 SC rpm +85mm TB ?9-10psi (N/A 208hp/280tq)
311rwhp/342rwtq corrected* (345rwhp/375rwtq Dynojet) 4.0L TURBO 0.030" stock pistons, stock rods, stock head, stock springs, stock manifold and stock TB, Comp 232 cam, Megasquirt MS3x, walbro 255lph, Borg Warner S300 63mm T4 .88A/R turbo, 39mm WG, 14psi boost, air-air IC, E85, 14psi boost, GM 400 auto trans, 4x4, 242, dana 30/44
322rwhp/405rwtq corrected*(358rwhp/450rwtq Dynojet) '00 TJ 4.0L 5sp MagnumPowers M90 SC 85mm TB water IC 20-21 psi (stock 138rwhp/180rwtq)
395hp/465tq@4500 Engine dyno Turbo 13-14psi '99intake cam ported head 105octane 74lbFP Blew Head Gasket 'Turbo Tom' Drag AMC
425rwhp/539rwtq Mustang dyno 4.7L Turbo 16psi, ported alumn head, 218*/224* 0.500" 114LSA 8.5:1 T76/.96 Air/Water IC 93octane, Methanol inj 4"exhaust
692hp@5000/777tq@4000 Engine dyno 5.0L Turbo 30PSI Air/Water 505 Perf
You boost curve must really ramp up. Probably a bit too big turbocharger. It would be interesting to see your boost curve also on chart.
Having said that, you have the 3rd highest power Jeep I6 engine. I have been collecting dyno numbers for a long time.
Even with Dynojet reading 10% high, you still rank right up there. I have to add you to my list.
311rwhp/342rwtq corrected* (345rwhp/375rwtq Dynojet) 4.0L TURBO 0.030" stock pistons, stock rods, stock head, stock springs, stock manifold and stock TB, Comp 232 cam, Megasquirt MS3x, walbro 255lph, Borg Warner S300 63mm T4 .88A/R turbo, 39mm WG, 14psi boost, air-air IC, E85, 14psi boost, GM 400 auto trans, 4x4, 242, dana 30/44
JEEP DYNO-
230rwhp/257rwtq estimate (325hp/363tq engine dyno) 4.9L Stroker ported BV head 470 carb stock Clifford intake Newcomer Racing
237rwhp/317rwtq ?dyno '01 TJ 4.0L +Borla Headers and Magnum Powers Supercharger intercooled 8psi
243rwhp/360rwtq Mustang dyno '01 TJ 5speed 5.0L Built Stroker+Magnum Powers M90 SC 7.9"/2.75"= 13,932 SC rpm 6psi (N/A 208hp/280tq)
256rwhp/268rwtq estimate (361hp@5400/377tq@4800 engine dyno) 4.9L Stroker ported BV head bigger carb intake + headers
256rwhp/313rwtq corrected*(285rwhp/348rwtq Dynojet) 2WD 5sp 4.6L Stroker Vortech SC 5-7psi non-intercooler 42lb/hr injecors ECU tuned by FlyinRyan
263rwhp/353rwtq ?Dyno 4.6L Stroker Turbo 8.0:1 cam 10psi 'YJ + Corey'
268rwhp/375rwtq Mustang dyno '01 TJ 5speed 5.0L Built Stroker + M90 SC Magnum Powers 7.9"/2.75"= 13,932 SC rpm 7psi (N/A 208hp/280tq)
274rwhp/322rwtq ?Dyno 4.0L Turbo MS 36lb 50mm T3/T4 12psi 'Pseudosport Racecar'
307rwhp/402rwtq Mustang dyno '01 TJ 5speed 5.0L Built Stroker + M90 SC Magnum Powers 7.9"/2.75"= 13,932 SC rpm +85mm TB ?9-10psi (N/A 208hp/280tq)
311rwhp/342rwtq corrected* (345rwhp/375rwtq Dynojet) 4.0L TURBO 0.030" stock pistons, stock rods, stock head, stock springs, stock manifold and stock TB, Comp 232 cam, Megasquirt MS3x, walbro 255lph, Borg Warner S300 63mm T4 .88A/R turbo, 39mm WG, 14psi boost, air-air IC, E85, 14psi boost, GM 400 auto trans, 4x4, 242, dana 30/44
322rwhp/405rwtq corrected*(358rwhp/450rwtq Dynojet) '00 TJ 4.0L 5sp MagnumPowers M90 SC 85mm TB water IC 20-21 psi (stock 138rwhp/180rwtq)
395hp/465tq@4500 Engine dyno Turbo 13-14psi '99intake cam ported head 105octane 74lbFP Blew Head Gasket 'Turbo Tom' Drag AMC
425rwhp/539rwtq Mustang dyno 4.7L Turbo 16psi, ported alumn head, 218*/224* 0.500" 114LSA 8.5:1 T76/.96 Air/Water IC 93octane, Methanol inj 4"exhaust
692hp@5000/777tq@4000 Engine dyno 5.0L Turbo 30PSI Air/Water 505 Perf
Last edited by CobraMarty; Oct 20, 2018 at 06:40 AM. Reason: specs correction
Thread Starter
Newbie
Joined: Nov 2017
Posts: 15
Likes: 6
From: Long Island, NY
Year: 1997
Model: Cherokee (XJ)
Engine: 4.0 Turbo
For as impressive as your peak numbers are, it seems a bit soft below 4000 rpm.
You boost curve must really ramp up. Probably a bit too big turbocharger. It would be interesting to see your boost curve also on chart.
Having said that, you have the 3rd highest power Jeep I6 engine. I have been collecting dyno numbers for a long time.
Even with Dynojet reading 10% high, you still rank right up there. I have to add you to my list.
311rwhp/342rwtq corrected (345rwhp/375rwtq Dynojet 4.0L TURBO 0.030" stock pistons, ARP bolt stock rods, Edelbrock ported big valve head, stock springs, Clifford 4 barrel manifold and 102mm LS TB, Comp 232 cam, Megasquirt MS3x, walbro 255lph, Borg Warner S300 63mm T4 .88A/R turbo, 39mm WG, 14psi boost, air-air IC, E85, 14psi boost, GM 400 auto trans, 4x4, 242, dana 30/44
JEEP DYNO-
230rwhp/257rwtq estimate (325hp/363tq engine dyno) 4.9L Stroker ported BV head 470 carb stock Clifford intake Newcomer Racing
237rwhp/317rwtq ?dyno '01 TJ 4.0L +Borla Headers and Magnum Powers Supercharger intercooled 8psi
243rwhp/360rwtq Mustang dyno '01 TJ 5speed 5.0L Built Stroker+Magnum Powers M90 SC 7.9"/2.75"= 13,932 SC rpm 6psi (N/A 208hp/280tq)
256rwhp/268rwtq estimate (361hp@5400/377tq@4800 engine dyno) 4.9L Stroker ported BV head bigger carb intake + headers
256rwhp/313rwtq corrected*(285rwhp/348rwtq Dynojet) 2WD 5sp 4.6L Stroker Vortech SC 5-7psi non-intercooler 42lb/hr injecors ECU tuned by FlyinRyan
263rwhp/353rwtq ?Dyno 4.6L Stroker Turbo 8.0:1 cam 10psi 'YJ + Corey'
268rwhp/375rwtq Mustang dyno '01 TJ 5speed 5.0L Built Stroker + M90 SC Magnum Powers 7.9"/2.75"= 13,932 SC rpm 7psi (N/A 208hp/280tq)
274rwhp/322rwtq ?Dyno 4.0L Turbo MS 36lb 50mm T3/T4 12psi 'Pseudosport Racecar'
307rwhp/402rwtq Mustang dyno '01 TJ 5speed 5.0L Built Stroker + M90 SC Magnum Powers 7.9"/2.75"= 13,932 SC rpm +85mm TB ?9-10psi (N/A 208hp/280tq)
322rwhp/405rwtq corrected*(358rwhp/450rwtq Dynojet) '00 TJ 4.0L 5sp MagnumPowers M90 SC 85mm TB water IC 20-21 psi (stock 138rwhp/180rwtq)
395hp/465tq@4500 Engine dyno Turbo 13-14psi '99intake cam ported head 105octane 74lbFP Blew Head Gasket 'Turbo Tom' Drag AMC
425rwhp/539rwtq Mustang dyno 4.7L Turbo 16psi, ported alumn head, 218*/224* 0.500" 114LSA 8.5:1 T76/.96 Air/Water IC 93octane, Methanol inj 4"exhaust
692hp@5000/777tq@4000 Engine dyno 5.0L Turbo 30PSI Air/Water 505 Perf
You boost curve must really ramp up. Probably a bit too big turbocharger. It would be interesting to see your boost curve also on chart.
Having said that, you have the 3rd highest power Jeep I6 engine. I have been collecting dyno numbers for a long time.
Even with Dynojet reading 10% high, you still rank right up there. I have to add you to my list.
311rwhp/342rwtq corrected (345rwhp/375rwtq Dynojet 4.0L TURBO 0.030" stock pistons, ARP bolt stock rods, Edelbrock ported big valve head, stock springs, Clifford 4 barrel manifold and 102mm LS TB, Comp 232 cam, Megasquirt MS3x, walbro 255lph, Borg Warner S300 63mm T4 .88A/R turbo, 39mm WG, 14psi boost, air-air IC, E85, 14psi boost, GM 400 auto trans, 4x4, 242, dana 30/44
JEEP DYNO-
230rwhp/257rwtq estimate (325hp/363tq engine dyno) 4.9L Stroker ported BV head 470 carb stock Clifford intake Newcomer Racing
237rwhp/317rwtq ?dyno '01 TJ 4.0L +Borla Headers and Magnum Powers Supercharger intercooled 8psi
243rwhp/360rwtq Mustang dyno '01 TJ 5speed 5.0L Built Stroker+Magnum Powers M90 SC 7.9"/2.75"= 13,932 SC rpm 6psi (N/A 208hp/280tq)
256rwhp/268rwtq estimate (361hp@5400/377tq@4800 engine dyno) 4.9L Stroker ported BV head bigger carb intake + headers
256rwhp/313rwtq corrected*(285rwhp/348rwtq Dynojet) 2WD 5sp 4.6L Stroker Vortech SC 5-7psi non-intercooler 42lb/hr injecors ECU tuned by FlyinRyan
263rwhp/353rwtq ?Dyno 4.6L Stroker Turbo 8.0:1 cam 10psi 'YJ + Corey'
268rwhp/375rwtq Mustang dyno '01 TJ 5speed 5.0L Built Stroker + M90 SC Magnum Powers 7.9"/2.75"= 13,932 SC rpm 7psi (N/A 208hp/280tq)
274rwhp/322rwtq ?Dyno 4.0L Turbo MS 36lb 50mm T3/T4 12psi 'Pseudosport Racecar'
307rwhp/402rwtq Mustang dyno '01 TJ 5speed 5.0L Built Stroker + M90 SC Magnum Powers 7.9"/2.75"= 13,932 SC rpm +85mm TB ?9-10psi (N/A 208hp/280tq)
322rwhp/405rwtq corrected*(358rwhp/450rwtq Dynojet) '00 TJ 4.0L 5sp MagnumPowers M90 SC 85mm TB water IC 20-21 psi (stock 138rwhp/180rwtq)
395hp/465tq@4500 Engine dyno Turbo 13-14psi '99intake cam ported head 105octane 74lbFP Blew Head Gasket 'Turbo Tom' Drag AMC
425rwhp/539rwtq Mustang dyno 4.7L Turbo 16psi, ported alumn head, 218*/224* 0.500" 114LSA 8.5:1 T76/.96 Air/Water IC 93octane, Methanol inj 4"exhaust
692hp@5000/777tq@4000 Engine dyno 5.0L Turbo 30PSI Air/Water 505 Perf
CF Veteran
Joined: Dec 2011
Posts: 1,777
Likes: 22
From: PA KOTUFU!
Year: 1998
Engine: 4.0L 162,000
Stock parts and slipping converter, Even more impressive.
Correction made, thanks.
Can't wait to see with Clifford 4 barrel intake manifold, 102mm TB, and Ported big valve Edelbrock head and 'tighter' converter or lock up converter.
It seems like the turbo is a bit too big as there is not much below 4000 rpm, 250tq is like only 4-5psi boost. After 4000rpm it really picks up.
Although this might be good as less power and TQ at lower rpm will save the drivetrain and better tire hookup.
Yeah Valve Springs are difficult to find that will fit and work well and not flatten the cam.
Russ has some LS springs that might do the trick.
Correction made, thanks.
Can't wait to see with Clifford 4 barrel intake manifold, 102mm TB, and Ported big valve Edelbrock head and 'tighter' converter or lock up converter.
It seems like the turbo is a bit too big as there is not much below 4000 rpm, 250tq is like only 4-5psi boost. After 4000rpm it really picks up.
Although this might be good as less power and TQ at lower rpm will save the drivetrain and better tire hookup.
Yeah Valve Springs are difficult to find that will fit and work well and not flatten the cam.
Russ has some LS springs that might do the trick.
Thread Starter
Newbie
Joined: Nov 2017
Posts: 15
Likes: 6
From: Long Island, NY
Year: 1997
Model: Cherokee (XJ)
Engine: 4.0 Turbo
Yeah, the turbo is definitely on the large side for this configuration, but it was good back when i first had the unmodified aluminum head on it. With the proper matching valve springs I would be able to turn it up to 6000rpm no issue, and it would peak around 22-23 psi, however this was before i had a dyno and i was afraid to mess with the timing too much so it was far less advance than it is now. But rather than thinking what it would be if it was all well, I am building a new motor and refreshing the whole truck, new converter and trans, new fuel pump etc. The new engine will be a destroked 4.0, 3" stroke vs 3.41" for a stock motor for a final displacement of 3.6L, coupled with the forged rotating assembly, super high flow head, giant throttle body on a port matched manifold, and possibly a roller cam, I hope to break the record.
Member
Joined: Jul 2017
Posts: 115
Likes: 0
From: Aurora CO
Year: 1996
Model: Cherokee
Engine: 4.0
would love to see a video or pics on the wiring setup...mostly because I want to see how you built yours, in comparison to using the factory harness with larger injectors like I plan to...ill still run megasquirt but not going so far as to use LS parts in my jeep. also what is the break in like on your motor? same as a regular 4.0 or is it different?
