Differences

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--- performance:superchargers:m90 [2020/04/29 03:02] – ben
+++ performance:superchargers:m90 [2022/10/04 18:24] (current) – [Intercooling] ben
@@ Line 1: / Line 1: @@
 ====== Eaton M90 ======
-Series 2 L67 engines were equipped with a generation 3 Eaton M90 supercharger. The M90 is a 90 cubic inch supercharger (1.47 liters) in displacement. On the L67 it was fitted with a 3.8" diameter pulley and produced about 8 psi of boost from the factory.
+===== Overview =====
-[[{{:engine_details:e909091b3b0c3882466738d60d4bdd54.png}}|]]
+The M90 is a 90 cubic inch supercharger (1.47 liters) in displacement. On the 3800 it was fitted with a 3.8" diameter pulley and produced about 8 psi of boost from the factory.\\
+Series 2 L67 engines were equipped with a generation 3 Eaton M90 supercharger and Series 3 L32 engines were equipped with the generation 5 (Gen V) M90. Both are quite similar, however the generation 5 M90 is slightly more efficient at making power. From the factory the generation 5 was able to produce 20 more horsepower according to GM.{{  :engine_details:e909091b3b0c3882466738d60d4bdd54.png?nolink&400x206}}
-In Australia there were several rear wheel drive vehicles that were equipped with an M90 as well. These versions of the M90 have a slightly different throttle body opening to allow it to be fit in a longitudinal orientation.
+===== Pulley Swaps =====
-{{https://www.midrear.net/images/4sale/M90-GEN3.jpg?nolink&|Supercharger Sell Out + 440cc Injectors}}{{https://galleryplus.ebayimg.com/ws/web/324088747029_1_0_1.jpg?nolink&|v6 commodore supercharger | Got Free Shipping? (AU)}}
+The pulley on the M90 can be pressed off with a puller tool and replaced with a smaller pulley. There are also modular pulley hubs and pulleys that are available from the main vendors for the 3800.
-===== Series 3 (L32) =====
+Generally when swapping to a smaller pulley more supporting mods will be necessary to minimize the amount of heat being generated by the supercharger. Typically most recommendations are to install performance modifications to the engine to help it flow more air more easily to minimize the amount of pressure the supercharger has to make.
-Series 3 L32 engines were equipped with a generation 5 Eaton M90 supercharger. This is sometimes referred to as a "GenV" supercharger on many forums. This was also equipped with a 3.8" diameter pulley but it was slightly more efficient than the generation 3 m90 that the L67 was equipped with.
+===== Intercooling =====
-[[{{:engine_details:fbf26454cb18f05f95ef61d3b8a1e971.png}}|]]
+Another option is to install an intercooler below the supercherger to reduce the amount of heat it creates. This allows you to run a smaller pulley on the supercharger and can also help decrease heatsoak.
+Without an intercooler the M90 will produce enough heat to induce a noticeable loss of power when making runs in quick succession. The intercooler will go a long way to make the power output of an M90 engine more consistent.
+Switching to E85 will make a huge difference in heatsoak as well.
+===== Power limit =====
+Most M90 powered cars will generally max out around 400 wheel horsepower with an aftermarket camshaft, headers, and an intercooler.
+If you want to make more power than this then you may want to consider a larger supercharger or switching to a turbocharger.