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| From naturally aspirated 225 to a boosted 170 https://slantsix.org/forum/viewtopic.php?t=66100 |
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| Author: | Dart270 [ Wed Aug 07, 2024 11:10 am ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
It takes seemingly forever for me to get results sometimes, but I always get results eventually! FYI, I will be attending a science conference in Tromso, Norway in 3 weeks, and I almost got a flight with a stop in Helsinki. I also thought about trying to get a 1-3 day stop in Finland, but I was not able to do that. Someday, it would be great to meet you! Anyway, just letting you know I was thinking about that. Cheers, Lou |
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| Author: | lgu32 [ Wed Aug 07, 2024 12:29 pm ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
You’re welcome when you have possibitity to come here. Pls inform before to confirm I am here; We just finished one week mc tour where we ride Stockholm-Oslo-Stavanger-Bergen-Oslo-Stockholm loop. |
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| Author: | Dart270 [ Wed Aug 07, 2024 2:51 pm ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
Will do! No idea when this might come up again. Wow, that sounds like a great cycle trip! Lou |
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| Author: | lgu32 [ Tue Aug 27, 2024 5:34 am ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
Quote:
That should get you down at least 500 RPM and it should still be great up high. I would even go 216 LSA and maybe 214 deg @ 0.050" for a street car, or 218/218 and 116 LSA sounds about perfect. Leighton Drake used quite small cams (like the MP 244/0.436" cam) and still made 500 HP on a 225. I am going to try the Howards cam 214/214 with 0.450" lift and 112 or 114 LSA on a 225. On a 170 you should go wider on the LSA. Kenny Duttweiler (famous turbo V6 guy and Bonneville authority) recommended 116 LSA for Bob Dally's 170 bcuda with turbo.
Such a 218/218/116 cam now exist. I probably install it to somewhere 112 to 114. Lou I bought a used core cam with an oil pump it has been driving. If the pump looks okay I will use it. If not I will use the gear to the new pump. I dont need 6 bolt pump as I have a oil sprayer in the location of distributor. Ignition is made by waste spark six output coil. |
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| Author: | Dart270 [ Wed Aug 28, 2024 11:48 am ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
Cool! Good luck with the building and testing... Lou |
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| Author: | lgu32 [ Wed Oct 23, 2024 9:37 am ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
As my garage season is just opened - I got other stuff out of it and autumn is going too cold for my E85 Dart - I am planning go and start the build. My head is "blueprinted" to 58cc and the block has almost stock height - letters stamped from factory still exists. Pistons are "some brand" and just below the deck. As I dont plan to run gasoline ever with this but just E85 should I mill the head a bit for compression increase? Something like 9-9.5. Still the 218-218-116 cam is pretty much wilder than stock. |
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| Author: | Dart270 [ Wed Oct 23, 2024 2:46 pm ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
I am not schooled in E85 usage. Maybe search internet for how much CR you might increase vs. gasoline on boost? I would probably stay at 8.5-9:1 myself, but again I have not researched this... Lou |
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| Author: | lgu32 [ Wed Oct 23, 2024 11:52 pm ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
Quote:
I am not schooled in E85 usage. Maybe search internet for how much CR you might increase vs. gasoline on boost? I would probably stay at 8.5-9:1 myself, but again I have not researched this...
It is said "not pinging". The rattle heard is because parts are bending and cracking. Probably I keep what I have and just control the boost by ECU. Lou I am planned to set the cam to about same as the 224/224/110 was. Intake in between 106-110. So the biggest difference with the new cam is the exhaust lobe advance by the added LSA (116-110=6). And I hope the factory cam core with factory pump gear will be better than parts I have had. |
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| Author: | lgu32 [ Mon Feb 24, 2025 2:49 am ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
First start with a new cam. As I have efi I found huge lambda value change at low vacuum. The map was build to make 1.0 at low vacuum but with a new cam I saw 1.3 or more. This mean that the engine get some 30% better fill at low vacuum with the new cam. As we still have winter I cannot do remapping or roadtests yet. But what I did at the garage using brake I found boost at stall. Seem I have got good suggestions from you guys. New cam is 218 @ 0,05” with 114 LSA. Old was 224 @ 0,05” and 110 LSA. |
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| Author: | Dart270 [ Mon Feb 24, 2025 5:00 am ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
That's great! You may not lose much (or anything) at higher RPMs, and building the boost down low will really help with ease/predictabtility of driving, and getting you off the line more quickly. I'm excited to hear about tests... Best wishes, Lou |
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| Author: | lgu32 [ Fri Mar 07, 2025 9:43 pm ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
 Gear on, left foot on a brake pedal. Little throttling. About 2000 rpm. Still about 1000 rpm below stall. Manifold vacuum reads 77kPa. But what happens in a tube from turbo to the throttle blade? There is already 110kPa and this is far below from stall! Sadly it is too early for road tests. But this a quite promising. |
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| Author: | Dart270 [ Sat Mar 08, 2025 3:12 am ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
Yes, looks promising. Must be only a tiny throttle opening. I have never looked/tried a MAP sensor upstream of the throttle, and that is a great idea. What type/brand/size turbo do you have on there again? Lou |
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| Author: | lgu32 [ Sat Mar 08, 2025 11:32 am ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
T3/4 ”hybrid” from a brand Maxxspeedingrods. Was listed for 1,5 - 2,5 liter engines. It was cheap but the quality was surpricing good EXCEPT… The original wastegate actuator was not good. Lucky me I had protective shut down at ecu. It took power down at 200 kPa where the boost went immediately at apprx 4000 rpm. I tried to tune the original actuator with few external springs:  That spring outside of actuator reduced the operating point and was adjustable. I found possible to do that but I got it better result after purchasing a Mamba actuator with a set of different springs. Mamba actuator cost more than that cheap turbo. There was still some unattended boost increase at high rpm 6000+ so I ported the waste gate hole inside the turbine from 16mm to 19mm and rounded the hole opening. Later I bought an extra soft spring (0,5-0,7 bar) to actuator. That was used at the test for power output. Test was a must for the inspection of the car. The turbo is now street legal as the power output is not too high. Bit later I made an active control for the boost by ecu. That system is my own design with a restricted leak controlled by a Burkert proportional valve. The control system is ”open loop” like an old style ”turbo screw” but is tuneable from ecu. No adjustable screws anywhere.  I have this kind of table for the proportional valve PWM and I can get set the max boost stepless from the actuator nominal pressure ”to as high I like”. No need to change parts for adjustment. That valve get also the turbo spinning faster than without. I have used that same style pressure control system in my Sportster. I keep it normally at 0,5 bar but for fun I raise it to 0,8 bar, |
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| Author: | Dart270 [ Sun Mar 09, 2025 3:03 am ] |
| Post subject: | Re: From naturally aspirated 225 to a boosted 170 |
Sounds cool. Interested to hear about road tests when you have good weather, etc. Lou |
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